Question about 1997 Cadillac DeVille

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I have a 99 deville. Over hating, changed thermastat, water pump,. I asked the radiator shop and they told me that there are two fans in front of the radiator that can stop working. I checked mine and they are not turning on when needed. I am ordering the relays that turn them on. Hope this works. CR

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  • Anonymous Apr 19, 2009

    Hello I have the same problem I have a 1998 cadillac deville that is overheating when I go up hill I replaced the waterpump and the thermostat. Did you ever figure out what is going on with your car cuz I was thinking that it might be a blown headgasket but im not having any of those symtoms of a blown head gasket because I should have smoke coming out the pipes and radiator fluid in the oil and none of that is happening. I'm thinking that it might be the fans also but I dont really think that its a head gasket. But it might be the fans like your thinking did you get a pressure test yet.

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  • Cadillac Master
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Check the cooling temperature sensor.

Posted on Apr 16, 2009

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99 cadillac deville runnin hot


Look for the silly stuff. Check for things blocking off the radiator, coolant level, water pump belt, etc. If none of those help, check the cooling fan, coolant temperature sensor, fan relay and fan fuses. If everything there is working, consider a stuck thermostat, an obstruction in the cooling system itself or a failed water pump. Kind of a long shot but engine timing can also make it run hot. Hope this helps.

Jan 27, 2017 | 1999 Cadillac DeVille

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My 99 Cadillac deville is overheating. I've replaced radiator fan thermostat and water pump. What else could it be? My husband thinks the intake is clogged up with stop leak


Did you replace the radiator and fan or just the radiator fan? Stop leak won't clog up the intake, Holes are too big. But will clog up the radiator. Usually the heater core goes first though.

Jul 10, 2016 | Cadillac Cars & Trucks

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Thermastat and water pump changed but still overheating. why?


Could be a few things. Blockage in the radiator, blown headgasket, bad fan. Need to check for those or get a shop to have a look.

Feb 11, 2015 | 2008 Saturn Aura XE

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Hello im wondering why my truck keeps over heating after iv changed the thermastat 4 times and temp sensor im i also had the intake gaskit changed right befor this started i was pulling out out of the...


CLUTCH ON COOLING FAN FREEWHEELING. COOLING FAN SHOULD HAVE RESISTANCE WHEN TURN WITH HAND WHEN ENGINE HOT.IF NOT FAN FREE WHEEL FAN CLUTCH NEEDS TO BE REPLACED.IF COOLING FAN OKAY.YOU COULD HAVE BLOWN HEAD GASKET.YOUR RADIATOR AND ENGINE BLOCK NEED FLUSHING OUT.CHECK WATER PUMP FOR LEAKING WEEP HOLE IF LEAKING REPLACE WATER PUMP.

Nov 12, 2010 | 1991 GMC K1500

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Don't know what to do.


Have you checked the rad to see if you are getting good antifreeze circulation. You may need a new water pump if the circulation is poor. Check to see if all you rad fins are tight & in good shape. It could be the radiator is losing it's efficiency & may need replacement. Hope this helps you. Good luck!

Jul 30, 2010 | 1999 Cadillac DeVille

1 Answer

Gets hot,head gaskets were changed and head was checked for cracks,it was fine,also put in new water pump and thermastat,and fan clutch...what else could it be?


could be a plugged radiator,have a shop put a flow tester in line and see if its flowing at capacity,hope this helps

Oct 03, 2009 | 2001 GMC Jimmy

1 Answer

I have a 99 deville. Over heating, changed thermostat, water pump,. I asked the radiator shop and they told me that there are two fans in front of the radiator that can stop working. I checked mine and...


What makes you think its the relays ? How about THE FANS themselves, or the coolant switch that tells the electric fans when they should turn on. Test his procedure. Place the climate control on AUTO at 65. A/C compressor turn on ? Did the COOLING FANS tun on ? If they did , at least you know they work. Hope this helps.

Apr 16, 2009 | 1997 Cadillac DeVille

1 Answer

Got a 96 crown vic that runs but smoking white smoke from under the hood and it runs hot ....the resevoir is full so there is no leak there and i replaced the thermostat but it didnt work


you ether have a coolant leak or one of these are the problem thermastat,fan clutch,water pump,radiator, try this start car when it reachs normal temp open hood and pinch the top radiator hose if it is hot water is flowing thermastat is good now open radiator with a towel slowly while it is runing see if the water is moving if it is you water pump and radiator are good, now at some point in this time you should have heard the fan get loud if not your fan clutch is not work it mounts to the front of your water pump and is normal to go out because they lose about 250rpm a year which does not give them much of a life, dont forget to check your heater hoses they could be leaking

Dec 19, 2008 | 1996 Ford Crown Victoria

3 Answers

99 cadillac deville


hello i have a 1998 cadillac deville course. an i been having the same over heating problems with mine i been taking it to mechanics an no one seems to know even the caddy dealship its overheating i checked the termostat water pump radiator all hoses was wondring could you tell me what you did or what you are doing to fix your problems my email is teree1234@yahoo.com thank you very much

Aug 02, 2008 | 1999 Cadillac DeVille

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