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All replacement thermostats keep sticking closed causing the engine to run hot?

Tiny
FRANK38061
  • MEMBER
  • 2005 CHEVROLET EQUINOX
  • 3.4L
  • V6
  • 2WD
  • 165,000 MILES
I replaced the coolant system parts that were bad; the water pump, radiator, thermostat, reservoir cap, temperature coolant sensor, and bled the system. However, I drove the car for 1 hour and the thermostat stuck causing the car to run hot. The thermostat keeps getting stuck no matter how many news one I put in there they get stuck and causing it to run hot.
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Tuesday, August 1st, 2023 AT 7:05 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,356 POSTS
Yep, this happens when the handbasket blows because it forces exhaust into the system which the thermostat will not react to. To confirm the issue please go over these guides:

https://www.2carpros.com/articles/recognizing-the-symptoms-understanding-a-blown-head-gasket-in-your-vehicle

and

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

Please go over these guides and get back to us.

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Tuesday, August 1st, 2023 AT 1:40 PM

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