Grand Cherokee 2WD V6-3.7L (2008)
Radiator Cap: Testing and Inspection
DIAGNOSIS AND TESTING
Remove cap from radiator. Be sure that sealing surfaces are clean. Moisten rubber gasket with water and install the cap on pressure tester (tool 7700 or
an equivalent).
Operate the tester pump and observe the gauge pointer at its highest point. The cap release pressure should be 110 to 138 kPa (16 - 20 psi). The cap is
satisfactory when the pressure holds steady. It is also good if it holds pressure within the 110 - 138 kPa (16 - 20 psi) range for 30 seconds or more. If the
pointer drops quickly, replace the cap.
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.
