1988 GMC Other Repair Question
Topics covered: Cooling system, Engine, Pressure test.
Mileage: No information provided.
Mileage: No information provided.
Asked on December 7, 2009
1988 Other GMC Models sudden pressure cold
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 ?
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 ?
Asked by chuck mayAnswer
Replied on January 8, 2010
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.