Refrigerant Control Solenoid Valve: Testing and Inspection

Rear A/C Solenoid Valve

For circuit descriptions and diagrams, refer to Air Conditioning/Heater in Wiring Diagrams.

NOTE: Prior to performing the following checks, verify that the front A/C system is operating properly.

1. With the engine running, the front A/C switch in the On position and the rear A/C blower switch in the Off position, check that the rear evaporator is not colder than the ambient temperature. If the evaporator temperature is colder than the ambient temperature, the solenoid is allowing refrigerant to flow through the rear evaporator when in the closed position. If OK, go to Step 2. If not OK, replace the rear A/C solenoid valve.
2. With the ignition switch in the Off position and the rear A/C solenoid valve wire harness disconnected, check for continuity between the two solenoid valve terminals. If OK, go to Step 3. If not OK, replace the solenoid valve.
3. With the ignition switch in the Off position and the rear A/C solenoid valve wire harness disconnected, check the solenoid valve ground circuits for a good ground at all times. If OK, go to Step 4. If not OK, repair the open circuit to ground as required.
4. With the ignition switch and the front A/C switch in the On position and the rear A/C solenoid valve wire harness disconnected, check the harness for battery power at terminal 2. If OK, replace the solenoid valve. If not OK, test the A/C control module as required.