Question about 2001 Cadillac DeVille

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Car is running hot 2001 deville, new radiator, themostat, waterpump, still running hot, had it flush out.

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Could be lots of things.
For example, the temp sending unit could be bad and it may not really be hot.
You need to verify with a thermometer.
Or you could have put the thermostat in backwards, so the activator is not on the hot side.
Or you could have an air bubble big enough to be blocking the flow of coolant.
The fan may not be coming on, or the water pump belt could be loose.
The water pump could have been the wrong fit and it rubbing.
But it could also be unrelated, such as you must have over heated it when you discovered the water pump was leaking, so maybe you got it hot enough to blow the head gasket.
Check that with a cooling system pressure tester, and see if it oscillates when the engine is running at high revs. Make sure there is no leaks while and it holds pressure.
But it could also be something as simple as the antifreeze getting into the catalytic converter and plugging it up. You can check back pressure at the O2 sensor.
Make sure it is idling well and there is nothing wrong with timing, injectors, plugs, or wires, because a missing cylinder will make it run hotter.

Posted on Mar 23, 2011

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As long as the mixture is 50/50 water to coolant then i would say faulty thermostat stuck closed replace........cheap parts have seen 3faulty in a row b4.hope this helps.

Posted on Mar 23, 2011

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1 Answer

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valley pan has nothing to do with running hot unless you are losing water , you should do a radiator flush kit and after flushing it replace the thermostat with a new one

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Sounds like you have a clogged radiator, i would recommend trying to flush it out before replacing it.

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I replaced my waterpump and all gaskets in the housing. now the temp gauge on the DIC jumps high and low then dissappears and my service light came on...whats the deal?


once you have changed the water pump you refill the radiator to the neck and and run the car with the fan on and wait till the themostat opens.you will know this because the antifreeze level in the radiator will drop,let run and refill radiator and replace the cap.fill the overflow bottle to the full mark. on some models you have a bleeder on top of the engine to bleed the system. i would also pressure test the radiator cap or replace it as this is not exspensive but a vital part.

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Why does my 2001 cadillac deville keep running hot. ive changed the water pump and the thermistat


Well there could be a couple of problems if you live in a hot place you should change the thermostat to a lower tempatured one so the water will circulate sooner that will help it run cooler if that doesn't do it it might need the radiator flushed.

Jul 29, 2009 | 2001 Cadillac DeVille

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Car is running hot. Just got new hose put on and radiator flushed and themostat. What is the problem?


Check the availability of morte than one thermostat for your engine. You may have the wrong one in and it's not opening at the lowest setting. Causing the engine to overheat before it will allow the coolant to circulate properly. The other answer lies within the efficiency of your waterpump.

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I would have the radiator roded out by a radiator shop, this of course requires removal of the radiator to complete the rod out.

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