3.5L/2.0L Diesel

Fig 1: Identifying Radiator Pressure Cap - Typical

Courtesy of CHRYSLER LLC

1 - FILLER NECK SEAL

2 - VACUUM VENT VALVE

3 - PRESSURE RATING

4 - PRESSURE VALVE

CAUTION: Vehicles equipped with 2.0L/2.4L engines use a different pressure cap than vehicles equipped with 3.5L/2.0L engines. The pressure caps are NOT interchangeable. Verify proper pressure cap part number.

Hold the cap in your hand, right side up . The vent valve at the bottom of the cap should be normally closed. The vent valve should open with a slight pull with your finger nail.

Replace the cap for any of the following conditions:

Rubber gasket has swollen, preventing the valve from opening
Any light can be seen between the vent valve and the rubber gasket. Use only a replacement cap that has a spring to hold the vent shut.
Gasket on the bottom of the cap shows noticeable thinning
Cap has been through more than one engine overheat.