Operation CHARM: Car repair manuals for everyone.

Thermostatic Air Cleaner Vacuum Switch: Testing and Inspection

1. With engine temperature below 85° F, tape a thermometer in air cleaner.
2. Install air cleaner cover and start engine.
3. When cold air door starts to open, remove air cleaner cover and check temperature.
- If temperature is below approximately 85° F, sensor must be replaced.


NOTE: If hoses have been removed from connectors for any reason, it is very important that they be correctly positioned for proper operation.