ATC Servo, Valve, and Switch Assembly

The three failures associated with the servo, valve and switch assembly are:
1. A vacuum leakage at the diverter valve.
2. Electrical (blower) failures.
3. Loose attachments.

Observe the servo door movement with the vacuum input change for attachments. Refer to All Function Selector Valve Positions Leak diagnosis. All Function Selector Valve Positions Leak