Heat comes and goes

2002 PONTIAC MONTANA
160,000 MILES • 3.4L • V6 • 2WD • AUTOMATIC
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LONELYREDNECK85
  • MEMBER
  • 1 POST
flushed heater core then had heat for one day and now overheats.
Jan 3, 2018 at 5:29 AM
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STRAILER
  • CERTIFIED EXPERT
  • 53,854 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

Jan 4, 2018 at 3:06 PM