Gets very hot on initial warmup?

Tiny
FGGB
  • MEMBER
  • 1989 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 1,500 MILES
The temperature gauge goes to red on initial startup. Then moves close to 210-230. The engine is new, and all related components are new. Changed thermostat several times, gauge, clutch fan, and both temperature sensors. Old engine ran 160ish with leaking head gaskets.
Wednesday, December 20th, 2023 AT 12:19 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,144 POSTS
So, it is easy to get the incorrect water pump on these engines which will try to move the coolant in the wrong direction. The serpentine belt routing is important as well. Here is how the belt should go, also if you have the radiator cap on does the cooling system build pressure immediately? Please go over this guide as well:

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

With the engine warm can you see coolant circulating inside the radiator? Check out the images (below). Please let us know what happens.

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Thursday, December 21st, 2023 AT 2:19 PM

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