Thermostat

1997 CADILLAC DEVILLE
84,000 MILES • V8 • FWD • AUTOMATIC
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GSWELLI
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  • 1 POST
What is the recommended temperature for the coolant in a 97 Cadillac Sedan deVille D'Elegance with a V8 Northstar engine? If the thermostat needs to be replaced, where the heck is the darn thing?
Jan 14, 2010 at 9:29 AM
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KASEKENNY
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The engine should be operating around 190 degrees, but this is going to vary slightly depending on the engine and what thermostat you have in the engine.

However, it should not be over 210 or consistently above 205. If the engine gets hot and then cools down, then that is fine but if the temperature stays over 205 and does not drop then that is too high but not going to damage the engine.

Here is a guide that will help with replacing this:

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

I am attaching the info below from the manual on how to replace this. However, the engine should be flushed at the same time so here is a guide that will help with this.

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

Please run through this and let us know what questions you have.

Thanks
Apr 14, 2022 at 6:22 PM
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