Troubleshooting an Automobile’s Air Conditioning Problems

Diagnose a Non-working Air Conditioner in a Car
September 2, 2016

Troubleshooting an Automobile’s Air Conditioning Problems

What is HVAC? and where can you find best HVAC repair services in newyork? Have you ever thought about it? If not don’t worry we are here to provide you complete guide regarding HVAC car systems and their troubleshooting problems as well. Just stay calm and read step by step about and tiny aspect related to HVAC.

Compressor Problems

What commonly causes an automotive air conditioner cooling system problem is the lack of refrigerant in the system. If the refrigerant has escaped through a leaky compressor or leaked or anywhere where there is leakage, the leak needs to be identified and repaired right away before the system is refilled with refrigerant. On almost all AC systems, if the compressor does not turn on, it means that the refrigerant is low since the low pressure safety switch prevents the compressor clutch from working if the pressure of the system is low. This works to protect the compressor from possible damage due to lack of lubrication. If there are any evident leakage around the compressor shaft seal, the seal should be replaced. If the magnetic clutch is not engaging the compressor despite receiving voltage, it means that the clutch is defective and needed to be replaced too.

Compressor problems usually happens due to the use of the wrong type of lubricant, loss of lubrication due to leaks that results to low refrigerant level in the system. Another is a blockage such as a plugged orifice tube which prevents refrigerant and oil from properly circulating to the compressor. Next thing that you should check when troubleshooting a non functioning AC system is the system pressure in which can be checked using a set of air conditioning gauges. This can be done by attaching the device on gauges and set it to the high and low service fittings. If both the high and low side pressure gauges shoes low pressure, it only means that the system needs recharging. However before recharging the unit with refrigerant, make sure that no leaks are present to where the refrigerant is going.


Refrigerant Leak
Poor cooling of the air conditioner is often due to a low charge of refrigerant. All vehicles especially older type ones leak refrigerants that seeps through loose seals and pores of the hoses. The older the vehicle the higher the possibility of loose seals. Newer vehicles have better seals and barrier style hoses so they typically leak refrigerants less than older ones. However the newer vehicles tend to have smaller system capacity so any loss of refrigerant will effect the cooling performance of the car’s air conditioner.

There are various methods that can be used to check for refrigerant leaks. Leaks can be found by adding special dye to the system or an electronic leak detector. Another good method is by spraying soapy water onto the hose connection and observe for the site of bubbles, however it requires adding refrigerant and turning on the AC for you to know where the leaks are. Repairs should be done first before recharging the AC system with refrigerant.

Noise Issues
Noise from the compressor can be caused by cross-contaminated refrigerant where it is possible that the operating pressure is too high, the air in the system is contaminated or wrong type of compressor lubricant used. It is also possible that the noise came from the hoses or other parts in the engine compartment rattling against each other. You need to check the placement of the hoses, support brackets and other parts to locate where the noise is coming from.

Bacteria, moulds,fungi and other microorganisms can rapidly grow in the presence of pungent odours inside the air conditioning system when it is not in use. The dark and moist interior of the AC especially during winter is a perfect breeding ground for these microorganism. It is unhealthy to breathe and can very much contribute to what is so called “sick car syndrome”.If a vehicle air conditioner blows out air when it is turned on that smells like athlete’s foot or like someone died in it, then microbes are growing on the evaporator.

To get rid of those unwanted organisms there are various chemical agents that you can spray directly on the evaporator or through the blower ducts. There are also available replacement evaporators with
Special chemical coating that inhibits the growth of microbes especially molds and bacteria. The drainage tubes carrying the condensation away from the evaporators should also be checked and cleaned.

Air Conditioner Flushing
Flushing can help prevent repeated compressor failures and system blockages by clearing and cleaning out sludge and debris trapped in the system. If the compressor has failed, it only shows that the system is contaminated and thus needs cleaning by flushing with an approved flushing reagent (such as Dura 141b) to facilitate the flushing. If contamination is found on the orifice tube or expansion valve, it should be replaced then however flushing is an option that is a lot more practical and economical.

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