Refrigerant Control Solenoid Valve: Description and Operation

Rear A/C Solenoid Valve

The rear A/C solenoid valve is a two-position electrically operated shut-off valve, which is used to control refrigerant flow to the rear A/C evaporator from the A/C compressor. The solenoid valve is located in the rear A/C evaporator housing and is attached by a bracket.

The solenoid valve is used by the rear A/C control module to control rear A/C output temperature and to prevent evaporator freezing. Evaporator temperature is controlled by cycling the solenoid valve open and closed, thereby controlling refrigerant flow to the rear evaporator. The normally closed valve only allows refrigerant to flow through it when power is supplied to the solenoid by the rear A/C control module.