Initial Inspection and Diagnostic Overview

INSPECTION

CAUTION: Vehicles equipped with 2.0L/2.4L engines use a different pressure cap than vehicles equipped with 2.7L engines. The pressure caps are NOT interchangeable. Verify proper pressure cap part number.

Fig. 31 Cooling System Pressure Cap - Typical:

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.