Test H

PINPOINT TEST H: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLET(S) - MANUAL CLIMATE CONTROL

Test H1-H3:

Test H4-H6:

Test H7-H9:

Test H9-H11:

Test H11-H12:

Test H13-H16:

Test H16 Continued:

Normal Operation
Under normal operation, the function selector switch is provided vacuum from the engine. When a position is selected, vacuum is applied to the desired vacuum control motor that is connected to the mode door you want to control.

Possible Causes
- Function selector switch.
- Heater control valve.
- Vacuum control motor.
- Stuck or bound linkage or door.
- Leaking or plugged vacuum hose.