Trouble shooting overheating while idling

1988 CHEVROLET 1500

179,869 MILES • 5.0L • V8 • 4WD • AUTOMATIC

HILLDAWGZ89

MEMBER
1 POST

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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May 3, 2021 at 10:59 PM

ASEMASTER6371

✓Experienced Mechanic
52,796 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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May 4, 2021 at 12:40 AM