SERIOUSLY OVERHEATING AT IDLE?

MALLYBOY

MEMBER
1997 CADILLAC SEVILLE
4.3L
V8
2WD
AUTOMATIC
146,789 MILES

This vehicle was driven at the highway, next I noticed the temperature gauge rise. I stopped and allow to cool, I top water and It didn't stopped, I have replace radiator, it didn't solve. How can I tell if the water pump is good?

Monday, January 13th, 2025 AT 11:46 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

Are the cooling fans running when hot? It sounds like the thermostat is bad. To check the water pump, you will need to remove it and inspect the impeller.

Here is a guide you can go over to help see why the engine is overheating:

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

Here is the location and how to change out the thermostat. Once the unit is out you can start the engine for a second to see if coolant is forced out. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.

Images (Click to make bigger)

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Tuesday, January 14th, 2025 AT 11:03 AM

MALLYBOY

MEMBER
334 POSTS

Once the unit is out you can start the engine for a second to see if coolant is forced out! There was no thermostat on the vehicle. I have done so by removing the inlet hose-pipe and I was putting water to the engine and check the pressure, there was no pressure forcing the water out. I have also watch radiator.

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Tuesday, January 14th, 2025 AT 12:11 PM

KEN L