Toyota
Dodge Durango
 Service Manual
Cooling System » Diagnosis and testing
Radiator cap-pressure testing

Remove cap from radiator. Be sure that sealing surfaces are clean. Moisten rubber gasket with water and install cap on pressure tester 7700 or an equivalent (Fig. 24).

Fig. 24 Pressure Testing Radiator Cap-Typical Fig. 24 Pressure Testing Radiator Cap-Typical

1 - PRESSURE CAP

2 - TYPICAL COOLING SYSTEM PRESSURE TESTER

Operate tester pump to bring pressure to 117 kPa (17 psi) on gauge. If pressure cap fails to hold pressure of at least 110 kPa (16 psi) replace cap. Refer to following CAUTION.

The pressure cap may test properly while positioned on tool 7700 (or equivalent). It may not hold pressure or vacuum when installed on radiator. If so, inspect radiator filler neck and cap's top gasket for damage. Also inspect for dirt or distortion that may prevent 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.

    More about «Diagnosis and testing»:

    On-board diagnostics (obd)

    Preliminary checks

    Electric cooling fan

    Radiator coolant flow check

    Cooling system-testing for leaks

    Viscous fan drive

    Accessory drive belt diagnosis

    Thermostat-gas engines

    Radiator cap-to-filler neck seal-pressure relief check

    Radiator cap-pressure testing

    Coolant-low level aeration

    Cooling system-deaeration

    Dodge Durango Service Manual / Cooling System / Diagnosis and testing / Radiator cap-pressure testing

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