Pressure Cap
WARNING: This page is about a different car, the 2020 Chrysler 300 and 2019 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the pressure cap (1). Be sure that the sealing surfaces are clean. Moisten the rubber gasket with water and install the cap (1) on the SVT275 cooling system pressure tester (2) (available from Mopar® Service Equipment), or an equivalent.
- Operate the tester pump to bring pressure to 124 kPa (18 psi) on the gauge. If the pressure cap (1) fails to hold pressure of at least 110 kPa (16 psi), replace the cap. Refer to the following CAUTION .
- The pressure cap may test properly while positioned on the SVT275 pressure tester tool (or equivalent), but may not hold pressure or vacuum when installed on the radiator. If so, inspect the radiator filler neck and the radiator cap top gasket for damage. Also inspect for dirt or distortion that may prevent the cap from sealing properly.
CAUTION:
Radiator pressure testing tools are very sensitive to small air leaks, which will not cause cooling system problems. A pressure cap that does not have a history of coolant loss should not be replaced just because it leaks slowly when tested with this tool. Add water to tool. Turn tool upside down and recheck pressure cap to confirm that cap needs replacement.