- Inspect the vacuum supply to the vacuum/electric solenoid (vacuum hose-PPL) while the engine is running. The following conditions need to be met:
- Test each vacuum actuator by disconnecting the vacuum hose and applying vacuum directly to the actuator. Repair or replace as needed.
- Reconnect all the vacuum and electrical connections.
- Run the engine and cycle through the operating modes of the heater-A/C control while observing the valve actuators.
- Inspect for vacuum to the mode valve actuators by noting the mode valve actuator position.
- If a valve actuator retracts when it should not, replace the heater-A/C control. Refer to Heater A/C Controls in Instrument Panel, Gauges and Console.
- If a valve actuator does not retract when it should, inspect for vacuum leaks, restricted hoses or binding valves.
| • | The vacuum should be approximately 60 kPa (18 psi) with the engine running. |
| • | The vacuum should remain at approximately 60 kPa (18 psi) when the engine is turned OFF. |
When vacuum is applied, the actuator will retract. Refer to the table below.
If OK, replace the vacuum/electric solenoid. Refer to Vacuum Electrical Solenoid Replacement in HVAC Systems - Automatic.
Component/ Temp./Position | Defrost Solenoid | Heater Solenoid | Bi-Level Solenoid | Recirc Solenoid | A/C Solenoid |
|---|---|---|---|---|---|
Vacuum Hose Color | Blue | Red | Brown | Orange | Yellow |
Heater and A/C Control | Defroster Valve Actuator | Defroster Valve Actuator | Inner and Outer Mode Valve Actuator | Air Inlet Valve Actuator | Outer Mode Valve Actuator |
Off | Vacuum | Vacuum | Opt | Vent | Vent |
Auto 16°C (90°F) | Vacuum | Vent | Vent | Vent | Vacuum |
Auto 32°C (90°F) | Vent | Vacuum | Vent | Vacuum | Vent |
Bi-Lev | Vent | Vacuum | Opt | Vent | Vent |
Upper | Vent | Vacuum | Opt | Vacuum | Vacuum |
Lower | Vacuum | Vacuum | Opt | Vent | Vent |
Defog | Vacuum | Vent | Vent | Vent | Vent |
Def | Vacuum | Vent | Vent | Vent | Vacuum |
Maximum | Vent | Vacuum | Vacuum | Vacuum | Vent |
