Pressure Testing Radiator Cap
NOTE:
A pressure testing tool is used to test both radiator cap and complete cooling system. Test as follows, or follow tool manufacturer's instructions.
Visually inspect radiator cap, dip in water and connect to tester. Pump tester to bring pressure to upper limit of cap specification. Refer to COOLING SYSTEM SPECIFICATIONS article in this section. If cap fails to hold pressure within given specification, replace cap.