Cooling System Pressure Test
system pressure test is used to locate leaks quickly. Low air pressure is forced into the
system, causing coolant to pour or drip from any leak in the system.
tester is a hand-operated air pump used to pressurize the system for leak detection.
Install the pressure tester on the radiator filler neck. Then pump.the tester until the
pressure gauge reads radiator cap pressure.
Do not pump to much pressure into the cooling system or part damage may
in the system, inspect all parts for coolant leakage. Check at all fittings, at gaskets,
under the water pump, around the radiator, and at engine freeze (core) plugs. Once the
leak is located, tighten, repair, or replace parts as needed A pressure test can also be
applied to the radiator cap. The radiator pressure test measures cap-opening pressure and
checks condition of the sealing washer. The cap is installed on the cooling system
tester to pressurize the cap. Watch the pressure gauge. The cap should release pressure at
its rated pressure (pressure stamped on cap). It should also hold that pressure for a
least 1 minute. If not, install a new cap.