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1988 Other GMC Models sudden pressure cold

Tiny
CHUCK MAY
  • MEMBER
  • 1988 GMC
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 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?
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Monday, December 7th, 2009 AT 6:27 AM

1 Reply

Tiny
MICKEY-D
  • MECHANIC
  • 304 POSTS
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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Friday, January 8th, 2010 AT 4:12 PM

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