Test A: Incorrect/Erratic Direction Of Airflow From Outlets

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

A1-A4:

A4-A6:

A6-A8:

A8-A10:

A10-A11:

A12-A17:

A18-A20:

Normal Operation
The function selector switch directs vacuum to the appropriate vacuum control motor(s), controlling the door movement.

Possible Causes
- Vacuum hose(s) restricted or broken
- Vacuum control motor
- Airflow control door(s)
- Function selector switch
- A/C vacuum check valve
- A/C vacuum reservoir tank
- Stuck or bound linkage or blend door