What can be dangerous to a technician when replacing a burned out compressor?
If a compressor does burn out, the oil becomes extremely acidic. If all this acid is not removed when the compressor is replaced, the high acid levels will attack the new compressor and cause another compressor motor burn-out in a short period of time.
What happens when a compressor burns out?
Compressor burnout is a very specific mode of failure that may be caused by high temperatures in the motor windings or discharge area of the compressor. High temperatures break down the motor winding insulation, which may cause a loss of electrical resistance and result in a short to the ground or even an open winding.
Why would a compressor burnout?
Do you have to flush the AC system before replacing the compressor?
You have to flush the condenser of the AC system before replacing the compressor. However, most automakers including Toyota recommend the replacement of the condenser and hoses instead of flushing in case of contamination.
Can a new expansion valve be flushed after a compressor failure?
If the expansion valve (TXV or orifice tube) are in a system that requires flushing, the expansion valve needs to be replaced with a new unit. Also not able to be flushed: accumulator and receiver-drier. These, too, are on the replace-not-flush list.
What causes an air conditioner compressor to fail?
Another cause of compressor failure is the intrusion of water into the system. The PAG oil contained within the R-134a system will react with water moisture and create corrosive acid compounds. As these acids circulate within the system, they will literally corrode the system from the inside out.
How to diagnose AC system service and component replacement?
DIY Auto Service; AC System Service and Component Replacement DIY Auto Service; AC System Diagnosis by Symptom Static Pressure means the system is not running. Compare this pressure with the ambient temperature to gauge the amount of refrigerant in the system.