SUDDEN PRESSURE COLD

1988 GMC

Tiny

chuck may

December, 7, 2009 AT 6:27 AM

Engine Cooling problem
1988 Other GMC Models V8 Two Wheel Drive Automatic 130000 miles

i was checking my unit for coolant leak. It was cold
had not been started. I pump up pressure with
cooling system pressure tester to 16 psi.
looked over cooling system for leaks.
started unit observed pressure guage climbing to
25 psi. Shut off unit released pressure to zero.
started unit again pressure did not go out of range
16 psi. Possible head gaskets?

FOUND 13549 RELATED QUESTIONS

1 Answer

Tiny

mickey-d

January, 8, 2010 AT 4:12 PM

When an engine is cold. It can build up pressure until the thermostat opens. Don't pump the tester, let it build normally, and see what happens. You should also pressure test the cap.

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