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Trouble shooting overheating while idling

Tiny
HILLDAWGZ89
  • MEMBER
  • 1988 CHEVROLET 1500
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 179,869 MILES
Truck listed above is a Sierra. Overheating while idling once I start driving the temperature goes back to normal. Also When I’m driving my transmission drag a little changing from 2nd to 3rd gear.
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Tuesday, May 4th, 2021 AT 5:59 AM

1 Reply

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

This sounds like the clutch fan may not be turning fast enough to pull cool air through the radiator. Once you start moving, the air if forced through the grille.

https://www.2carpros.com/articles/fan-clutch-removal

I attached some possibilities for you of overheating.

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

I would start with a thermostat and flush.

https://www.2carpros.com/articles/replace-thermostat

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

Roy
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Tuesday, May 4th, 2021 AT 7:40 AM

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