Question about 1999 Cadillac DeVille

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1999 cadillac deville overheats

I just bought the car and I believe the radiator cooling fans are not kicking in and the engine overheats when it idles and I'm at a red light. I checked the fuse for the fans and seems to be ok. The wiring to the fans don't seem to be factory wiring. I found a wire that is not connected to anything but I'm not sure if it links into the fan's wiring.

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Every thing that is electric needs a power and a ground if running a new wire to the fans i would prefer you to use a inline fuse this will keep the wire from catching on fire. u could run the power wire to a fuse that is ignition switch 1,2,3 one of these will work so when u turn the key they kick on. also the ground could be a bolt on the bottom of vehicle. use a test light and see if that wire hanging down is a power wire. hope this helps

Posted on Apr 09, 2010

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Posted on Jan 02, 2017

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2000 cadillac deville is overheating, replaced thermostat: water pump radiator had head gaskets fixed it's saying check coolant level and it spews coolant from the overflow tank cap when hot thoughts?


Two cooling fans controlled by three relay's . If only one fan is working ,that could be a problem .
Coolant Level Sensor Description
The coolant level sensor monitors the coolant level in the cooling system and indicates if the coolant is low. This sensor is located at the base of the radiator surge tank and is not serviceable.
CHECK COOLANT LEVEL (2)
The IPC receives a discrete input from the engine coolant level switch. The engine coolant level switch is normally closed. When the engine coolant is low, the engine coolant level switch opens. When the IPC receives an open signal from the engine coolant level switch, the IPC displays the message on the DIC.

Relay Driven Dual Cooling Fan Diagnostics There are using a pontiac , by your cadillac is the same .

Mar 24, 2017 | 2000 Cadillac DeVille

1 Answer

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

1 Answer

We need help with an overheating problem on our 1999 Cadillac DeVille. We've replaced many parts and wonder if it may be air in the cooling system. Please help.


Could be.
Has the thermostat been replaced ?
You could run the engine without the radiator cap to see if the system has air pockets.
A restriction in the exhaust could cause the engine to run hotter on the road than on short trips.

Aug 04, 2012 | 1999 Cadillac DeVille

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99 cadillac deville engine overheating an loosing coolent couple times a day.Replaced thermostat, water pump ok, cooling fans on at 217deg.,radiator pressure tested an holding pressure.engine still keeps...


Check to see if you have flow through the entire radiator.If part of the radiator core is cool to the touch when the engine is at operating temp, this indicates restricted radiator flow. If the entire radiator core is not allowing water to flow through, cooling will not be at all efficient. Also a good idea would be to purchase a block tester. available at napa and other reputable parts houses for around thirty dollars. You remove a small amount of coolant, and put the tool in the radiator, or pressure tank opening. If there are any combustable gasses present, i'e' exhaust, this would indicate a head gasket breech, (or maybe worse) and would indicate that it's time to stop looking for a simple problems, and get proffessional help. Good luck to you!

May 12, 2011 | 1999 Cadillac DeVille

1 Answer

I have a 99 Cadillac Deville which is overheating and I think it is the thermostat. Can I do this myself? Is it easy to get at? I do have some mechanical skills.


you need to make sure the fans are turning on to cool the engine down first,the fans won't kick on until the coolant reaches 212 degrees ,make sure your not losing coolant ant radiator is full,check it when the engine is cold,the north star engines have a flaw in the head gaskets leaking,

Jan 04, 2010 | 1999 Cadillac DeVille

1 Answer

1998 Cadillac DeVille Overheats


The cooling fans will not come on until 225 degrees. Normal temp is around 199-215. Sitting still in traffic most will inch up around 220 or so. When you turn ac on it turns the fans on and may cool down engine, Check fan operation.

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1 Answer

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did you try replacing the radiator cap and the temp sensor?

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Overheating 1999 cadillac deville


THIS SOUNDS CRAZY BUT, ON SOME OF THE OLD SCHOOL CARS, THEY HAVE A CLUCH FAN.. AND IF ITS BAD, THE CAR WILL OVERHEAT WHEN DRIVING AND COOL DOWN AT IDLE.. I DONT THINK THE CADY HAS A CLUTCH FAN, BUT I BET ITS IN THE FAN.. GOOD LUCK KEITH..

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2 Answers

I have a 2000 cadillac deville


You can rent a cooling system preasure tester at a parts store. These engines run so close to boiling that they must be able to hold presure or they overheat. Presurize the system and check for even the smallest leaks at all hose connections. I fought this problem for a long time before I figured it out.

Oct 14, 2008 | 1999 Cadillac DeVille

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