Vacuum System - Testing

1. Check vacuum supply to vacuum/electric solenoid (purple vacuum hose) while the engine is running.
^ Vacuum should he approximately 60 kPa (18 psi) with the engine running.
^ Vacuum should remain at approximately 60 kPa (18 psi) when the engine is turned off.
2. Test each vacuum actuator by disconnecting the vacuum hose and applying vacuum directly to the actuator. Repair or replace as necessary.
3. Reconnect all vacuum and electrical connections. Run the engine and cycle through the. operating modes of the heater-A/C control while observing the valve actuators.

Air Delivery Vacuum Distribution Table:

^ Check for vacuum to the mode valve actuators by noting the mode valve actuator position. When vacuum is applied, the actuator will retract, refer to the Air Delivery Vacuum Distribution Table.
^ If a valve actuator retracts when is should not, replace the heater-A/C control.
^ If a valve actuator does not retract when it should, check for vacuum leaks, restricted hoses or binding valves. If OK, replace the vacuum/electric solenoid.