Rear A/C Expansion Valve

Rear A/C Expansion Valve

Description






The rear A/C expansion valve is of a thermostatic expansion valve design and controls the amount of refrigerant entering the rear A/C evaporator. The rear A/C expansion valve consists of an aluminum H-valve type body (1) with an integral thermal sensor (2). The rear A/C expansion valve is located on the bottom of the rear HVAC housing, which extends through the rear floor panel behind the right rear wheel housing.

Operation

The rear A/C expansion valve controls the flow of high-pressure, low temperature liquid refrigerant entering the expansion valve and converts it into a low-pressure, low-temperature mixture of liquid and gas before it enters the rear A/C evaporator. To meet the vehicles A/C cooling requirements, a mechanical sensor is used in the rear A/C expansion valve to monitor the temperature and pressure of the refrigerant leaving the rear A/C evaporator and then adjust the inlet port orifice size to allow only the proper amount of refrigerant to enter the evaporator. Controlling the refrigerant flow through the rear A/C evaporator ensures that none of the refrigerant leaving the evaporator is still in a liquid state, which could damage the A/C compressor.

• Replacement of the refrigerant line O-ring seals and gaskets is required anytime a refrigerant line or expansion valve is disconnected. Failure to replace the rubber O-ring seals and metal gaskets may result in a refrigerant system leak.

The rear A/C expansion valve is factory calibrated and cannot be adjusted or repaired and must be replaced if inoperative or damaged.