Vacuum System - Testing

IMPORTANT: To avoid misdiagnosis, complete Chart #2, "Air Flow From Outlets is Incorrect," before beginning Vacuum Diagnosis. Chart 2 Air Flow From Outlets Is Incorrect
1. Check vacuum supply to Vacuum/Electric Solenoid (black vacuum hose) while Engine is running.
^ Vacuum should be approximately 60 kPa (18 psi) with Engine running.
^ Vacuum should remain at approximately 60 kPa (18 psi) when 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 Engine and cycle through the operating modes of the Heater-A/C Control while observing the vacuum actuators.

Table #1 Air Delivery Vacuum Distribution:

^ Check for vacuum to the vacuum actuators by noting vacuum actuator position. When vacuum is applied, the actuator will retract, refer to Table #1: Air Delivery Vacuum Distribution.
^ If a vacuum actuator retracts when it should not, replace the Heater-A/C Control.
^ If a vacuum actuator does not retract when it should, check for vacuum leaks, collapsed vacuum hoses or binding valves. If OK, replace the Vacuum/Electric Solenoid.