Question about 1999 Cadillac DeVille

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1999 cadillac deville overheats due to the fan not coming on. What will cause the fan to not come on. How do I determine what the actual cause is.

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Run a live wire to the fanif it works, test for signal from the sensor, and the fan relay

Posted on Nov 19, 2009

Testimonial: "I will try that this weekend. What if the fan doesn't work still after I straight wire it? Would the problem be the fan motor then?"

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I have a 1998 and I have done all that and still fans not workin.

Posted on Mar 25, 2012

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Intermittent heating and air fan in 1999 cadillac deville.


check the connector on the speed resister they overheat and loose contact

Sep 10, 2012 | 1999 Cadillac DeVille

1 Answer

If fans are not working on a 1998 cadillac deville will it cause engine to overheat


Yes when you are sitting in traffic or just sitting the fans come on to cool the engine so if they are not working it will over heat. When you are on the highway the car should not over heat though becouse the wind is cooling the engine at this time.

Mar 24, 2012 | 1998 Cadillac DeVille

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99 deville,run normal,overheats when a/c is turned on over 250 degrees ,changed thermostat and coolant sensor,still overheats.


See if the AC fan at the front of the car comes on when the AC is turned on/ It needs the extra air flow.

Jun 18, 2011 | 1999 Cadillac DeVille

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1999 cadillac sedan deville overheats when you run the air conditioner


if you have an electric fan the temp sensor switch might be bad if you have a mechanical the clutch is bad you also shod check your thermostat goo chance that my be the problem good luck

Apr 22, 2011 | 1999 Cadillac DeVille

1 Answer

My 1999 Cadilac Deville over-heats.


Check to see if your fans are coming on and if not check the fuses and relays.............

Jun 26, 2009 | 1999 Cadillac DeVille

1 Answer

1999 Cadillac Deville and the radiator fans are not coming on


you should check the fuse in the fuse boxe under the hood and find the radiator fan fuse
if the fuse is no longer good the little piece of metal will be cut in the middle so replace it with the same number if it's a 20 AMP do not put a 30 or a 15 AMP
if the fuse is good then there might be some problem with wires (could be cut) or the radiator fan motor is no longer good
you should have it check
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Jun 14, 2009 | 1999 Cadillac DeVille

1 Answer

Overheats on hwy. Radiator fan does not engage after overheating


fan does not generally come on till you reach about 210f. second fay comes on when ac compressor is on. Allowing for gauge inaccuracy this does not sound like a problem. Have you checked for coolant loss inside or outside the engine? If coolant is low, it may not be reaching the sensor unless you make pump run faster. Those engines are known for head and intake gasket problems, which may be the underlying cause of what you described. A partilally obstructed radiator can give some of the symptoms but I don't thind that is it.

May 14, 2009 | 1999 Cadillac DeVille

1 Answer

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..

Mar 12, 2009 | 1999 Cadillac DeVille

2 Answers

I HAVE A 1999 DEVILLE


99 cadillac deville overheating put in new radiator,thermostat,waterpump. it stays cool at idle for a hour running.drivin about 15-30 minutes it overheats. is not using hardly any coolant to speak of.

Jan 05, 2009 | 1999 Cadillac DeVille

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