Heat comes and goes

Tiny
LONELYREDNECK85
  • MEMBER
  • 2002 PONTIAC MONTANA
  • 3.4L
  • V6
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Flushed heater core then had heat for one day and now overheats.
Wednesday, January 3rd, 2018 AT 5:29 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Yes, it sounds like you have a blown head gasket which fills the heater core with exhaust gases causing the heater to stop working.

Here is a guide to help you confirm the issue:

https://www.2carpros.com/articles/head-gasket-blown-test

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

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Thursday, January 4th, 2018 AT 3:06 PM

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