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:

H2-H4:

H5-H7:

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