Question about 2002 Cadillac Deville

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My Cadillac Is Running Hot - 2002 Cadillac Deville

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First thing to check is your coolant level. Make sure you have water or antifreeze i your coolant jug as well as your rediator. If they are both full, there are a couple things that might be wrong, but you will need some mechanical skills to replace them. Check your water pump as well as your thermostat. The Thermostat is located under the upper rediator hose where it connects into the block. The water pump is located directly behind the fan.

Posted on Sep 30, 2009

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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.




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


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


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.

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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Not enough description of the symptoms...
Could be a lot of things. Does it run hot when at hiway speeds?

Check the radiator fan. it must be turning whenever the A/C compressor is running (turn on the air conditioner on max cold... if the radiator fan is not spinning, change the fan motor.

Please ... more info.....

Posted on Sep 30, 2009

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I've checked the fans they are coming on , well, this is the first time it has overheated. Well I should say the temp gauge and the car info said engine overheating .. I immediately pulled over BC it was in the red, but when I got out to check it , I didn't hear any boiling sound like overheating not smell nor steam..I also grabbed the top hose it wasn't hot nor could I squeeze it.(like I was burping it ), I drove it home 10 miles pulling over and waiting for the temp gauge to go down. Not once did it really overheat like coming out .

Posted on Nov 20, 2015

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