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99 deville, electric cooling fans won't come on

99 deville, electric cooling fans won't come on

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Either the relay to fan is bad, burnt fuse, or temp sensor is bad. You can test all of them with an ohmmeter in the ohm position

Posted on May 02, 2010

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Posted on Jan 02, 2017

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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.

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There are two: the 10A A/C COMP FUSE in the engine compartment fuse/relay center and the 50A COOL FNS FUSE in the right maxi fuse block.

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radiator fan sensor faulty. the sensor opperates at certain high temp to switch the cooling fan on.

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99 Ford Contour electric radiator fan won't


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1 Answer

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Hi, Did you check the thermostat. If the thermostat is stuck and will not open properly, the fan will not come on. Have it checked out. Good luck.

Jun 07, 2011 | 1998 Cadillac DeVille

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.

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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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