Test A: Incorrect/Erratic Direction Of Airflow From Outlets

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

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 to control.

This pinpoint test is intended to diagnose the following:
- Vacuum check valve
- Vacuum hose
- Vacuum reservoir
- Vacuum control motor
- Function selector switch
- Air distribution door/linkage

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A20-A21: