Air Delivery Improper

Air Delivery Improper:

Air Delivery Improper


Mode Control Vacuum Calve Positions

1 OFF
2 MAX A/C
3 NORMAL A/C
4 BI-LEVEL A/C
5 VENT
6 HEATER
7 HEATER/DEFROST BLEND
8 DEFROSTER

A vacuum operates most of the air distribution system. Electrical power operates the blower motor.
The engine vacuum is routed through the following areas:
^ The vacuum check valve
^ The control vacuum selector
^ The vacuum tank

The vacuum check valve prevents vacuum loss. Heavy acceleration or steep uphill traveling may cause vacuum loss.

Vacuum applied to a vacuum actuator moves the air door to the air door's correct position.

Preliminary Inspection
1. Inspect the vacuum lines at the engine and vacuum check valve for a proper connection.
2. Disconnect the vacuum line that leads to the engine at the vacuum check valve.
3. Start the engine.
4. Inspect for vacuum presence. If no vacuum is present, repair as required.
5. Disconnect the vacuum line that leads to the vacuum tank at the vacuum check valve.
6. Use a hand vacuum pump in order to apply vacuum to the vacuum line that leads to the vacuum tank. If the vacuum does not hold, replace the vacuum line and/or the vacuum tank.
7. Disconnect the vacuum line that leads to the control at the vacuum check valve.
8. Apply vacuum to the check valve port. If the vacuum does not hold, replace the vacuum check valve.
9. Quickly rotate the temperature control from full COLD to full HOT several times
10. Listen for the temperature valve to seat in both positions.
If the sound indicates that the temperature valve is not fully seating or opening, inspect the temperature control cable for proper operation. If the problem persists, ensure that the temperature valve door operates freely with the blower off.
11. Ensure that the vacuum line seals are positioned correctly at the vacuum line multi-connector that is located above the right-hand sound insulator panel.
12. Perform the diagnosis.