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My truck is constantly overheating

Tiny
CHARLES RODGERS
  • MEMBER
  • 1995 GMC SIERRA
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 427,000 MILES
I can't figure out why. I have replaced the thermostat, water pump, and hoses. I tore down the motor and flushed it out I have also flushed out the radiator, put some stop leak and it still overheats. Can you help me?
Monday, February 24th, 2020 AT 9:07 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

First, the stop leak was a very bad idea. It does nothing but clogs up the radiator and heater core.

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Did you change the thermostat? What temp did you use when you changed t?

I would also do a leak down test to be sure a head gasket is not leaking compression into the cooling system super heating the coolant.

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy
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Monday, February 24th, 2020 AT 4:04 PM

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