{"id":15789,"date":"2018-05-31T11:08:05","date_gmt":"2018-05-31T01:08:05","guid":{"rendered":"http:\/\/keepincool.wpengine.com\/?page_id=15789"},"modified":"2023-11-27T13:56:40","modified_gmt":"2023-11-27T03:56:40","slug":"car-air-conditioning-facts","status":"publish","type":"page","link":"https:\/\/keepincool.com.au\/keepincool\/car-air-conditioning-facts\/","title":{"rendered":"Car air conditioning facts"},"content":{"rendered":"

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\n\t

\n\n\t \n CAR AIR CONDITIONING FACTS <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]<\/p>\n

CAR AIR CONDITIONING FACTS:<\/h2>\n

 <\/p>\n

Car air conditioning facts, was once a great luxury, is now a standard feature on most motor vehicles. While the servicing of modern car air conditioning systems is best left to professionals, you can get the most enjoyment from you\u2019re A\/C system if you know a bit about how it works and what malfunctions you should be on the lookout for.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n WHY DO I NEED TO HAVE MY A\/C SYSTEM SERVICED? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]<\/p>\n

All Vehicle Air Conditioning System Leak?<\/h1>\n

 <\/p>\n

All vehicle air conditioning systems leak<\/a> to a lesser or greater degree. The losses occur through refrigerant escaping through the pipe joins as a result of vibration and ageing of rubber hoses and \u2018O\u2019 ring seals, as well as through the seal on the front of the compressor shaft.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n HOW OFTEN SHOULD THE A\/C SYSTEM BE INSPECTED\/SERVICE? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]Annual car air conditioning Inspection is sufficient to check system condition and overall performance. Also, a service of the car air conditioning system should be carried out at least every two years even if it appears to be working well. Its estimated that you lose between 20-30% of the initial gas charge over a two year period and these figures based on new vehicles. Keepin Cool Auto Air Conditioning Specialist can provide a comprehensive list of all checks carried out and produce a report on the condition of the system.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n WHY DOES MY FRIDGE AT HOME NOT NEED SERVICING EVERY TWELVE MONTHS? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]A domestic fridge has no rubber pipes and no seal on the front of the compressor shaft; all piping is copper. Therefore, there is no leaking through the pipe walls.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n IS IT TRUE THAT THE VEHICLES A\/C SYSTEM SHOULD OFTEN RUN THROUGHOUT THE YEAR? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]Yes, this helps to keep the system well lubricated and leak tight.
\nWhy?
\nBecause the refrigerant carries the oil that lubricates the system, most importantly the compressor. It also keeps the seals and hoses moist, thus preventing them from drying out and cracking leading to leaks.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n WHAT\u2019S INVOLVED IN SERVICE? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]We measure the pressures in the system, check the quality of refrigerant present with a Gas Analyser and check all functions. Then we recover the refrigerant and vacuum the system down to a very low pressure (Deep Vacuum process) to remove any moisture that might be present. We then Re-Charge (Re-Gas) with virgin or re-cycled refrigerant R134a and also add a measured amount of the correct type of lubricant for your system. We also add UltraViolet dye to help find any leaks that may develop in the future.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n WHY CAN\u2019T I SERVICE THE SYSTEM MYSELF? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]This is difficult not only because the calculated specialise equipment is needed but most importantly the refrigerant present in the system must be recovered. Venting the refrigerant into the environment is ILLEGAL. Under Australian laws to protect the environment, the use of depleting substances and synthetic greenhouse gases is regulated. The licensing system ensures that only technician with adequate licences is allowed to service the vehicle\u2019s AC<\/a> systems. People operating without licence or authorisation are committing an offence and are subject to prosecution. More information is available at the Australian Refrigeration Council Website. The system is also under high pressure and needs pulling into a deep vacuum to remove any moisture. The refrigerants themselves have a very low boiling point and will cause freeze burns if they come into contact with skin or eye tissue. You have been warned!!!.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n WHY PUT ULTRA VIOLET (UV) DYE IN THE SYSTEM? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]The UV dye shows up under a bright UV light source. So any leaks present in the system can be easily identified either during fault finding or if future leaks were to develop.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n WHY USE NITROGEN FOR LEAK TESTING? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]We use Oxygen Free Nitrogen (OFN) for leak testing. It would be illegal to re-gas a system to use the refrigerant as a means of leak detection. The pure form of Nitrogen is a naturally occurring gas in the air that we breathe and so is safe and legal to use. The Nitrogen is inserted into the system under high pressure thus simulating a system in operation and revealing any leaks in the system.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n HOW DO I KNOW WHICH GAS IS INSIDE MY VEHICLE\u2019S SYSTEM? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]All vehicles manufactured before 1994 used R12 and all cars made after 1994 use R134a. Regassing of the cars with R12 is prohibited as this refrigerant destroys the ozone layer. If your vehicle uses R12, it needs to be retrofitted to R134a[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n WHY SHOULD MY GAS BE ANALYSED? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]Our Gas Analyser can reveal whether or not your gas is the correct type for your car air conditioning system and whether or not it is contaminated with other gases or has air in the sample which would strongly suggest a leak in the system.
\nThe wrong type of refrigerant could also bring about the premature failure of the compressor as it may not be able to carry the essential lubrication around the system.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n WHAT IS RETRO-FITTING? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]The term Retro-fitting is used to describe the procedure used to convert a car air conditioning system designed for use with R12 refrigerant, to be modified to operate using R134A.
\nRetrofits entail:
\nLabelling:
\nAll retrofitted systems must include refrigerant labels that specify which refrigerant is used. This helps prevent contamination of air conditioning systems and refrigerant supplies.
\nReplacing service fittings:
\nAll retrofitted systems must use unique fittings that match the refrigerant used.
\nAdding and recycling refrigerant:
\nDuring the retrofit procedure, the original refrigerant (CFC-12) is reclaiming in one of our dedicated recovery cylinders. Once full, these cylinders are then sent off to Refrigerant Reclaim Australia to be destroyed. New refrigerant is then added. Depending on the retrofit, additional parts may have to be replaced or the system components altered.
\nNote: Technicians handling air conditioner refrigerants must be certified by the Australian Refrigeration Council (ARC tick).
\nHealth Warning: It has been known for systems to be Re-Charged using Hydrocarbon based refrigerants, e.g. propane or methane mixtures. This means you could be driving around with a potentially lethal mix of gases in your system which in the event of a crash could explode with disastrous results.
\nKeepin\u2019 Cool does not recommend the use of hydrocarbon refrigerants or refrigerant blends of any kind in automotive air conditioning systems that are not explicitly designed for their use. Read the Queensland Government safety alert
\nIf you suspect your system may have been Recharged by a less than a professional operator. Have Keepin\u2019 Cool run a check for you. Better to be safe than sorry.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n WHAT CAUSES THE SMELL IN MY A\/C SYSTEM? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]The origin of the smell is caused by fungus, bacteria and other microbes growing inside the evaporator core. The moisture-laden environment is very conducive to the growth of these organisms. As automakers downsize components to save space and weight, this problem has been increased. Because the automakers made the evaporator smaller, they added more fins and packed them closer together to improve the efficiency of the evaporator. While this has made the evaporator more efficient, it has also made it more prone to trap moisture that contributes to the growth of these organisms. We offer a full odour removal service using the latest research, tools and equipment. Contact us to find out more.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n DOES MY VEHICLE\u2019S A\/C SYSTEM USE MORE PETROL? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]The answer to this is \u2018yes\u2019 it does, but not by much. But then think of the alternatives. You could have the windows open, but that would increase wind resistance which can add up to 10% to your fuel consumption, especially at speed. And don\u2019t forget the extra noise and pollution through that open window. Also, it\u2019s worth pointing out that you should run your car air conditioning at least once a week, especially in winter as the seals can seize up through non-use potentially costing you more in future in new parts and repair!!!.[\/vc_column_text] <\/div>\n<\/div>

\n\n\t \n WHAT ARE THE BENEFITS OF AIR CONDITIONING? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
\n
\n [vc_column_text]<\/p>\n
    \n
  • Efficient, cold air in summer!<\/li>\n
  • Warm dehumidified air in winter easily demists steamed up windows!<\/li>\n
  • Filters pollutants \/ airborne particles in pollen helping allergy sufferers!<\/li>\n
  • Pleasant and odour free vehicle atmosphere at all times.<\/li>\n<\/ul>\n

    [\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT\u2019S THE BEST WAY TO RUN MY VEHICLES AIR CONDITIONER? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]Turn the car air conditioning on, and ensuring that it\u2019s not set to \u2018economy\u2019 mode. Them when you first get into a hot car, open the windows, and ensure that the air vents are set to face level, and the system is set up to do the same, not pointed at your feet. And remember cold air falls. Then turn the temperature to as low as it will go, and the blower as high as possible. And also make sure that the air is in \u2018recircle\u2019 mode and not taking air from outside. Better to cool already cooled air!! When the temperature is more comfortable, close the windows and increase the heat to a more suitable level as well as decreasing the blower speed. You should also point the air vents upwards to ensuring the cold air flows down again.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHY IS THERE A POOL OF WATER UNDER MY CAR AFTER USING THE A\/C? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]If you see a puddle of water on the ground, usually under the passenger area, more explicit not be alarmed. This is a typical feature of the system as it is only water dripping from the air conditioning evaporator. The evaporator has a drain tube fitted to allow the condensation from the evaporator to drain away from the vehicle.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n CAN I USE TA HE A\/C SYSTEM TO DEFOG MY CAR? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]The car air conditioning system is far more efficient than the heater at defogging the windows of your car in damp weather conditions \u2013 turn it on along with your heater for more clear views! (Once your car\u2019s engine is at average operating temperature, running the heater and the A\/C together will produce warm, dry air).[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHY DO I NEED TO USE AN EXACT AMOUNT OF FREON? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]Today\u2019s car air conditioning systems use smaller amounts of Freon. No longer is it 900 to 2000 grams, but rather 450 to 1000 grams. Also, with tight compressor tolerances and lubricant mixed with the Freon, the mixture must be just right to enter the compressor as a mist. Wrong mixtures will either under lubricate or slug the compressor causing premature failures. You don\u2019t know how much liquid Freon is in a system so you should recover the old Freon, as well as evacuate and add the correct charge. Always check the OEM spec for the proper charge rate.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT IS A \u201cLIQUID CHARGE\u201d, AND WHY IS IT DANGEROUS? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]A \u201cLiquid Charge\u201d is any charging of the A\/C system using Freon which enters the A\/C system in a liquid state as opposed to a gaseous or Vapour state.
    \nWarning! Charge A\/C System with Freon as Vapour, not Liquid!
    \nIf a charging hose is long enough, you might get away with using liquid refrigerant because the liquid will partially change to a gas in the tube. The odds are not in your favour. More often you will freeze and shatter the compressors valves when the refrigerant hits the valves as a liquid. This happens in mere seconds, which is why we recommend charging the A\/C system with the engine off.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT CAUSES CLUTCH FAILURE? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]Some common causes of clutch failure:
    \n1. A missing clutch bolt
    \n2. Air Gap: Between the outer plate (hub) and the belt\/rotor (0.406mm -0.762mm) Note! Air gap varies with compressor type \u2013 check OEM specs.
    \n3. Shorted Coil \u2013 Due to improper polarity or weak\/burnt winding.
    \n4. Low voltage at the coil will cause the coil to overheat due to slippage.
    \n5. Locked Compressor: Excessive discharge pressure \u2013 Check for restricted condensers, receiver\/driers or oil overcharge
    \n6. The belt is the wrong type, wrong size, miss-aligned or loose.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT CAUSES COMPRESSOR FAILURE? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]Some common causes of compressor failures are:
    \nLACK OF USE:
    \nCompressors do not run regularly will be starved for lubrication when they are turned on. This causes excessive wear until the oil again reaches the compressor. It\u2019s best to use the A\/C once a week for a few minutes.
    \nFAILURE TO FLUSH SYSTEM:
    \nCompressors and hoses wear causing bits and pieces to mix with the oil. This sludge gets into the compressor and can cause it to seize. Failure to properly flush or using flush that leaves a residue is a primary cause of failure.
    \nEXCESSIVE HIGH OR LOW PRESSURE:
    \nCondenser fans can quit due to bad connections or defective motor winnings that get too hot. This creates extreme head pressure and heat that can lock up or damage a compressor. Loose connections at the coil can cause high resistance and low voltage causing clutch slippage. The low refrigerant charge will cause lack of lubrication getting to the compressor. Painting condensers will insulate them from efficiently removing heat and increase head pressure in the compressor.
    \nIMPROPER FREON OR OIL CHARGE:
    \nCompressors manufactured after 1990 have a smaller capacity, therefore use less refrigerant and oil and are extremely sensitive to inadequate amounts of oil. The wrong type of oil may break down in high heat conditions. R134a systems are more sensitive to lubrication than R12 systems. An over charge of oil can clog the condenser, the orifice tube or expansion valve and starve the compressor oil. R12 systems use mineral oil, and R134a systems use PAG 1 or PAG 2 Oil (always check the OEM specs)
    \nREFRIGERANT BLENDS
    \nThey can affect seals and O-rings, causing them to leak, swell or otherwise deteriorate and it can happen relatively quickly.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHY SHOULD I USE R134A REFRIGERANT? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]R12 has the ozone-depleting chemical chlorine in it and has been replaced with a refrigerant known as R134a. A boiling fluid absorbs heat and changes its state to a vapour. The expanding vapour\/gas has a lower pressure than the liquid and therefore lower temperature. For heated air to be absorbed, it must transfer to a more cooling surface. The trick is to find a liquid that boils at such a low temperature that the vapour is cold enough to absorb the amount of heat generated inside an automobile. Freon-12 boils at -30\u00ba C and its expanding vapour, in the evaporator core, incorporates the heated air circulating. Freon-134a boils at about the same temperature as R12 and therefore is a suitable replacement.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT DOES HUMIDITY HAVE TO DO WITH MY AIR CONDITIONER? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]You\u2019re A\/C unit works to remove heat from the passenger area and in doing, so it also eliminates moisture. We are most comfortable when the relative humidity is closer to 20 percent than 90 percent. Therefore the A\/C system expends most of its effort wringing moister out of the air. This is what air conditioning is all about \u2013 conditioning the air. It\u2019s important to check the condensation drain at the bottom of the evaporator. If you see clear water dripping from your car, when parked\u2026 it\u2019s a good thing\u2026if it\u2019s from the evaporator.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHERE DOES THE \u201cHIGH SIDE\u201d BEGIN? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]Where ever the dam is located in the separation point. We call it a dam because it has high pressure on one side and low pressure on the other. This separator is called an Expansion Valve or an Orifice Tube. Its job is to allow only enough refrigerant through to enable gas expansion in the evaporator. By limiting the flow of gas, the high pressure back to the compressor.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n JUST WHAT IS THIS \u201cBLACK DEATH\u201d? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]Black Death, as A\/C techs know it, is a result of the breakdown of the refrigerant-lubricant. It causes excessive wear inside the compressor, and the extreme wear causes a black residue that is a combination of solder flux from the condenser and aluminium shavings from the old compressor. When this sludge cools, it hardens in the condenser. Repeated flushing will not remove it. However, when the system is charged and running, it liquefies, flows out into the liquid line and clogs the orifice tube. With less refrigerant flowing, past the orifice tube, the car air conditioning compressor is starved of lubricant and will lock up. The only answer is to replace the condenser.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT EXACTLY DOES A DRIER DRY? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]It\u2019s not the Freon!! It\u2019s the oil in the refrigerant that absorbs moisture and holds debris in the system. Replacing the drier or accumulator, in addition to evacuation, will assure better performance.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT IS YOUR POSITION ON FLUSHING? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]Oil, sludge and debris that are left in the system can clog the condenser, orifice tube or expansion valve and damage the compressor. Flushing can remove excess oil and debris from previous services. You do not want to add yet another charge of oil while leaving unknown amounts of oil in the system.
    \nCaution!
    \nOnly flush a condenser that capable of being cleaned. The answer to question #14 deals with this problem in greater detail.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT ABOUT SYSTEM LEAKS? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]At one time Freon was cheap and a 2oz. per year leak was acceptable in an 800-2000 gram system. Today systems are smaller and 1\/2oz makes a big difference in performance. Good halogen leak detectors will show most system leaks, under static conditions, however some will leak only when the system is in operation. This is where the insertion of a florescent dye can help find the leak. Note, to see the dye stain you need a UV lamp and the leak has to be where the light can reach it. Most car manufacturers approve the use of trace dyes, and some OEM\u2019s have been inserting trace dyes on the assembly line. Dye can be inserted either when charging or when the system is charged. The amount of dye used is less than 5 ml. and remains in the system even if the total charge is lost. The dye stains the oil not the Freon and only flushing will remove it.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT DOES ALL THIS A\/C JARGON MEAN? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]Glossary of Terms:
    \nACCUMULATOR: stores & filters Freon (on Low side of the system )
    \nBTU: British thermal unit
    \nAMBIENT AIR: outside air
    \nCAPILLARY TUBE: gas filled temperature-sensing tube
    \nCCOT: clutch cycling orifice tube that replaces the TXV
    \nCLUTCH CYCLE SWITCH: evaporator temp controlled switch that cycles clutch
    \nCOMPRESSOR: pump that moves the refrigerant.
    \nCONDENSER: heat exchanger-removes heat from the refrigerant
    \nDISCHARGE LINE: compressor outlet line
    \nDRIER: filters refrigerant (located on High side\u00a0of system)
    \nEPA: Environmental Protection Agency
    \nESD: Electrostatic Discharge
    \nEVAPORATOR: heat exchanger-removes heat from air
    \nHEAT: anything above absolute zero hason heat
    \nHEAT EXCHANGER: a device for transferring heat
    \nLIQUID LINE: moves high-pressure liquid through the system
    \nMANIFOLD: connects suction & discharge lines to compressor
    \nPAG: Polyalkylene glycol (lube used with R134a refrigerant)
    \nPROM: Programmable Read Only Memory \u2013 use in computers
    \nSUCTION LINE: between evaporator outlet and compressor
    \nTXV: Thermostatic Expansion Valve \u2013 maintains evaporator[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT IS A TON OF REFRIGERATION? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]One Ton of refrigeration is defined as the amount of heat (288000 Btu\u2019s) required to cause a change in state of one ton of ice to one ton of water at 32 degs. F in 24 hours.
    \nBtu\/hour ratings rate A\/C units. A one-ton unit is rated as 12000 Btu\u2019s (288000\/24) The average factory installed auto A\/C unit is rated at 1-3\/4 ton.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n HOW MANY DIFFERENT CONDENSERS ARE THERE, AND WHICH CAN BE FLUSHED? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]R134a condensers have more fins\/inch than R12 condensers and their fin diameters are smaller.( 6mm)
    \nTUBE and FIN: Oldest industry standard, 3\/8-inch diameter round tube condenser. Ok, for R12 but not recommended for R134a. This type of condenser is flushable.
    \n6 mm Multi-Flow: smaller, lightweight and more efficient than 3\/8-inch tube and fin and serpentine. Used in many domestic OE applications. This type of condenser is flushable.
    \nSERPENTINE: All aluminium, more efficient than tube and fin, used on smaller imports where space is limited. This type of condenser is not easily flushed, replacement is recommended.
    \nPARALLEL FLOW: all aluminium, this efficient design breaks up flow into tiny streams that give up heat more rapidly. This type of condenser is not flushable, replacement only!
    \nPARALLEL FLOW with SUB Condenser: Oval tube multi-flow and sub-condenser stacked up. Refrigerant flows through the multi-flow into the drier (called a modulator) then continues as a liquid into the sub-condenser. This type of condenser is not flushable, replacement only![\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT CAUSES EXCESSIVE CLUTCH CYCLING? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]It\u2019s common to assume low refrigerant is the cause of excessive clutch cycling and this often leads to adding refrigerant and thereby overcharging the system. Most vehicles have a compressor clutch cut out strategya based on an engine coolant temperature of 140.C\u2013116.C. The vehicles computer relies on a coolant temperature sensor to provide the signal for the compressor clutch decision, and if the sensor reads too high, the clutch will cycle off. Cooling systems with a 50-50 anti-freeze mix and the proper radiator cap should boil at around 134.C, so the system may not be lose when the compressor cuts out. Check the actual coolant mix and temperature by using an Infrared thermometer to check coolant temperature and a Scan Tester to tell you what temperature the sensor is signalling to the computer.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHY SHOULD I WORRY ABOUT ESD? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]During the testing and repair of computer controlled vehicles, we come in contact with components that may be damaged by ESD or static electricity. When installing new electronic components, the part itself may have developed a charge from contact with the package during handling; therefore you need to ground yourself to the body ground of the vehicle. This is quickly done by using a wrist strap that is available at most electronic supply stores.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n CAN COMPRESSORS TAKE ALL THAT HEAT? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]A\u00a0 car air conditioning compressor can take the heat, but if there\u2019s a condenser airflow problem, overcharge, inadequate lubrication, restriction, etc., the temperature can significantly rise and cause the compressor to seize. Some vehicles have compressors mounted low in the engine compartment, and due to reduced airflow the compressor can overheat and fail.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n DOES IT MATTER WHAT OIL I USE? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]The moving parts of a car air conditioning compressor must lubricate during operation. Then oil absorbed into the refrigerant that carries it through the compressor as a mist. Also oil over and under charge can damage the compressor. Compatibility of refrigerant oil is to determined by its ability to remain oil when mixed with the refrigerant. And not to become separated by a chemical reaction. As R12 systems use a non-foaming sulphur-free grade of mineral oil 5gs, formulated for that refrigerant and cannot be used in R134a systems. And R134a systems use either synthetic oil PAG 1 or PAG 2 oil.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT ARE THE \u201cTHREE LAWS OF AIR CONDITIONING\u201d? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]<\/p>\n

    Everything has heat except at absolute zero (-238.C)<\/h2>\n

    LAW I: to refrigerate is to remove heat \u2013 the absence of heat is cold.
    \nLAW II: also heat is ready to pass to anything that has less heat \u2013 nothing can stop the flow, you can only slow it down.
    \nLAW III: and if a change of state is to take place there must be a transfer of heat \u2013 If a liquid is to change to gas it must take on the heat.[\/vc_column_text] <\/div>\n<\/div>

    \n\n\t \n WHAT SHOULD BE DONE WHEN INSTALLING A COMPRESSOR? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
    \n
    \n [vc_column_text]<\/p>\n
      \n
    • Like lushing, with an approved solvent, to Clean the system.<\/li>\n
    • And replace the Accumulator\/Drier or Orifice tube.<\/li>\n
    • Also, replace manifold sealing washers or O-rings.<\/li>\n
    • Use a Vacuum Pump (20+ minutes) to remove moisture.<\/li>\n
    • Add the proper amount and type of oil. Check OEM spec.<\/li>\n
    • Also, rotate the compressor hub 12 times to oil the shaft seal.<\/li>\n
    • Then place a strong external airflow into the condenser.<\/li>\n
    • Also, check OEM specifications for the correct refrigerant charge.<\/li>\n
    • Then charge with VAPOR refrigerant and with A\/C and engine off.<\/li>\n
    • Do a leak test and check voltage at the clutch coil.<\/li>\n
    • Also, check belt tension and alignment.<\/li>\n
    • Check system operation at 1500 RPM and mid-blower speed.<\/li>\n
    • Then use gauges to check the system pressures.<\/li>\n
    • And only if the condenser is the type that can be flushed.<\/li>\n<\/ul>\n

      [\/vc_column_text] <\/div>\n<\/div>

      \n\n\t \n HOW DOES AN AUTOMOTIVE A\/C SYSTEM WORK? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
      \n
      \n [vc_column_text]All matter has a certain amount of heat except at absolute zero 238.C). Ice cubes feel cold to the touch, but actually, it just has less heat than your hand. Heat is transferring from your hand to the ice cube. It is the principle behind how an A\/C cools the air in a car. Heated air is circulated across a gas-filled evaporator and is transferred to the refrigerant gas making the airless hot. The heat-laden refrigerant then is drawn into the compressor, is super-heated by compression and forced through the condenser where the cooler outside air takes the heat from the refrigerant gas. Its next stop is the expansion device (TXV or Orifice tube), which meters refrigerant into the evaporator where it expands into a gas, and it starts over again.[\/vc_column_text] <\/div>\n<\/div>

      \n\n\t \n WHAT ABOUT \u201cLOW AIR FLOW\u201d? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
      \n
      \n [vc_column_text]<\/p>\n
        \n
      • The complaint: \u201cit used to blow harder\u201d. Things to check are:<\/li>\n
      • Low blower motor voltage due to a weak ground.<\/li>\n
      • Blower wheel is\u00a0loose on the motor shaft<\/li>\n
      • Defective blower relay.<\/li>\n
      • When air leak or obstruction in the air duct system.<\/li>\n
      • Air mode door is directing some of the flow to the heater outlet.<\/li>\n
      • Icing evaporator core due to condensation.<\/li>\n
      • Debris in evaporator housing that blocks air circulation.<\/li>\n
      • Obstruction of the air return.<\/li>\n<\/ul>\n

        [\/vc_column_text] <\/div>\n<\/div>

        \n\n\t \n MY CLUTCH (OR SWITCH) DOES NOT FUNCTION, WHAT CAN I DO? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
        \n
        \n [vc_column_text]Electronic circuits are sensitive to voltage drops and operate in narrow voltage ranges. Also, many connectors have a small spade or pin type connections and are engineered to have near zero resistance. And if the connection is even slightly loose, it will also affect the voltage. Then what may seem to be a defective component could be a bad connector. And the problem may also be corrosion. Therefore carefully brushing or using an electrical contact cleaner may cure it. Many OEM harness connectors are available as replacement parts.[\/vc_column_text] <\/div>\n<\/div>

        \n\n\t \n IS A LITTLE MOISTURE IN THE SYSTEM REALLY SUCH A BIG DEAL? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
        \n
        \n [vc_column_text]Moisture causes internal icing, and that obstructs the orifice tube or expansion valve. As well as it creates excessive high pressures, also low cooling. The car air conditioning system is a closed loop system.<\/p>\n

        So why does it need a Drier to remove moisture? Here\u2019s how moisture gets into the system. Also, refrigerant charged through service hoses not evacuated after being connected to the system will have air and moisture in them. Also, tubes left uncapped while replacing components allows moisture to enter.<\/p>\n

        Refrigerant oil is hygroscopic (water absorbing like a sponge) and left uncapped will have moisture in it. Recycling machines with old filters will not remove moisture from the coming refrigerant.<\/p>\n

        As condensation created when the Low side of the system gets cold, and then warms up when the system is turned off is absorbed into the system through the hoses. Then systems low on Freon will pull moisture into the system when they go into a partial vacuum.[\/vc_column_text] <\/div>\n<\/div>

        \n\n\t \n WHAT ARE THE BASIC A\/C SYSTEMS? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
        \n
        \n [vc_column_text]ORIFICE TUBE SYSTEM
        \nOrifice tube systems use an Accumulator located on the Low side of the system.<\/p>\n

        EXPANSION VALVE SYSTEM
        \nTXV systems use a Drier located in the High side of the system.[\/vc_column_text] <\/div>\n<\/div>

        \n\n\t \n HOW ARE CLUTCH CYCLING SWITCHES DIFFERENT? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
        \n
        \n [vc_column_text]Clutch cycling switch for R134a vehicles is\u00a0calibrated for the slightly higher pressure of R134a. The threads, on the switch fitting, have been changed to metric to avoid connecting to an R12 system.[\/vc_column_text] <\/div>\n<\/div>

        \n\n\t \n ARE YOUR COMPRESSORS COMPATIBLE WITH R134A REFRIGERANT? <\/span>\n<\/span>\n\n \n <\/span>\n <\/span>\n <\/span>\n<\/span>\n<\/h4>\n
        \n
        \n [vc_column_text]All of our compressors are remanufactured with retrofitting in mind. Each compressor is remanufactured with HNBR seals which allow the compressor to be installed in R134a refrigerant systems.[\/vc_column_text] <\/div>\n<\/div><\/div>[vc_empty_space height=”70px”][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

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