Question about 2001 Cadillac DeVille

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My 2001 cadillac deville is running hot still, i have got a new radiator, thermostat, cap for the water reservoir, and replaced the water reservoir, what could it be? I have done everything possible and nothing is leaking anywhere and the engine is fine

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  • MiAGon
    MiAGon May 11, 2010

    Are the replacement parts OEM? Did you properly match the thermostat? They come in different temperature ratings. Another thing... was the replacement due to it starting to run hot? If so, have you had it checked to confirm that it was really running hot and not a possible problem with the temperature sensor reporting an incorrect temp.? One last thing... have the water pump checked. If there is a problem with the pump, it may not be moving the water fast enough to cool down. Also have the fan checked. Hope this helps.

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  • Cadillac Master
  • 2,359 Answers

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

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Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

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A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

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Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

Posted on Dec 05, 2009

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