Test A: Incorrect/Erratic Direction of Airflow From Outlets

PINPOINT TEST A: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLETS

A1-A2:

A2-A3:

A4-A5:

A6-A7:

A7-A8:

A8-A9:

A9-A11:

A11-A12:

A12-A15:

A16-A19:

A19-A20:

A20-A21:

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
- Vacuum check valve
- Vacuum hose
- Vacuum reservoir
- Vacuum control motor
- Function selector switch
- Air distribution door/linkage