Test H: Incorrect/Erratic Direction of Airflow From Outlet(s) - Manual Climate Control

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

H1-H3:

H4-H6:

H7-H9:

H9-H11:

H11-H12:

H13-H16:

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.