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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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...


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1 Answer

Engine overheating in 1999 Cadillac Deville. Cooling fan not coming on but does kick in when A/C is on. This is my Mom's car and I need help


The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

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1 Answer

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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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I HAVE A 1999 DEVILLE


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I have a 2000 cadillac deville


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Oct 14, 2008 | 1999 Cadillac DeVille

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