1996 Cadillac Deville fans wont run

Tiny
MLYNNE
  • MEMBER
  • 1996 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 118,000 MILES
The fans aren't coming on like they should. Is it a relay? And how do I know which one
Thursday, July 17th, 2014 AT 12:07 PM

7 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
How hot is the car getting?
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Thursday, July 17th, 2014 AT 1:35 PM
Tiny
MLYNNE
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  • 4 POSTS
It gets around 206 but the fans won't always kick in. I have a new thermostat and new belts. Someone told me it could be the relay but I am unsure how to determine which one, being that my car has 3. I don't want to take it to a mechanic before I know what's wrong. The ones around here tend to take advantage of a woman. Please help me
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Thursday, July 17th, 2014 AT 1:59 PM
Tiny
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You don't have any problem at all. That fan isn't even programmed to come on until 223 degrees and that's low speed. High speed doesn't kick in until 234 degrees so don't worry about it.
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Thursday, July 17th, 2014 AT 2:28 PM
Tiny
MLYNNE
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I have already threw 3 serpentine belts due to overheating. Cadillac's will shut themselves off before much damage is done. I know there is a problem somewhere, I just cant pin point it
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Thursday, July 17th, 2014 AT 2:38 PM
Tiny
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I'm afraid you're dead wrong

First off, overheating will not cause it to throw a belt. You have some other issue there.

Second, that car will not shut down due to overheating unless it gets so hot that it melts the pistons and then it's going to need a motor.

This engine is engineered to run hot. 220 to 230 is a normal operating range when idling. It will run cooler when cruising.
You may have some problems but they are not cooling fan problems.
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Thursday, July 17th, 2014 AT 2:45 PM
Tiny
MLYNNE
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Do you have any idea what they may be? I really do appreciate your help
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Thursday, July 17th, 2014 AT 2:54 PM
Tiny
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Belts fly off because there is something wrong with the alignment of one of the pulleys. If any components have been changed recently, check there alignment with the rest of the pulleys. You may have to remove the belt to check but look for any pulley that has wear that causes it to lean when under pressure. If a pulley leans, the belt will track right off the edge. Sometimes tensioners will twist when under pressure. Check the harmonic balancer the make sure the rubber hasn't broken allowing the pulley to slip and slide out of alignment.
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Thursday, July 17th, 2014 AT 3:00 PM

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