SERIOUSLY OVERHEATING AT IDLE?

1997 CADILLAC SEVILLE

146,789 MILES • 4.3L • V8 • 2WD • AUTOMATIC

MALLYBOY

MEMBER
329 POSTS

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?

Jan 13, 2025 at 11:46 AM

STRAILER

✓ASE Certified Mechanic
54,832 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 enlarge)

Professional Diagram for 2CarPros Members
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Jan 14, 2025 at 11:03 AM

MALLYBOY

MEMBER
329 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.

Jan 14, 2025 at 12:11 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

Sounds good, I would remove the water pump for inspection.

Jan 15, 2025 at 9:51 AM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.