Thermostatic Air Cleaner: Testing
- Ensure that all vacuum hoses, flexible duct hose and air cleaner duct are in good condition. With engine cold, the heat control door in the air cleaner snorkel should be up, in the heat on position.
- With engine running at normal operating temperature, the door should be in the down, or heat off position.
- Turn off engine and allow to cool to 50°F. Remove air cleaner and apply 20 in. Hg vacuum with an external vacuum source to the temperature sensor. The door should be in the up position. If not, check vacuum diaphragm for proper operation.
- Apply 20 in. Hg vacuum to diaphragm. The diaphragm should not bleed down more than 10 in. in 5 minutes. The door should not lift off the bottom at less than 5 in. Hg, and should be in the full up position at no more than 8.5 in. Hg.
- If vacuum diaphragm does not meet specifications, replace it and repeat steps 1) and 2). If diaphragm performs as specified, but proper temperature is not maintained, replace temperature sensor and repeat temperature checks.
Courtesy of CHRYSLER GROUP, LLC