cooling fan

CHEVROLET CAVALIER
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CHRIS STARK
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  • 3 POSTS
I have a 1995 chevy cavalier 2.2 litre with 162000 miles. The cooling fan does not come on automatically. However when I disconnect the temp. sensor on the motor by the thermostat the fan comes on. I can then plug the sensor back in and the fan will kick back off when the temp. comes back down. Can you'll please tell what might be happening to cause this dilema. Thanks for any help you can give me on this matter.
Jun 23, 2007 at 1:56 PM
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E40WATER12
  • ✓Experienced Mechanic
  • 522 POSTS
The temp. sensor switch u disconnected from the thermostat, I think temp sensor needs replacing.

Good Luck.
Jun 25, 2007 at 7:45 AM
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CHRIS STARK
  • MEMBER
  • 3 POSTS
It has been replaced and is new.
Jun 25, 2007 at 8:10 AM
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BPRICE443
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  • 66 POSTS
Have you tryed the relays sometimes there is two one for high and one for low. Have you checked all fuses?
Jun 25, 2007 at 6:11 PM
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CHRIS STARK
  • MEMBER
  • 3 POSTS
the relay that is on the fuse panel, (under the hood) was replaced also. I dont know of another relay. Could you possible direct me to its possible location?

thanks
CHRIS

P.S. all fuses are good
Jun 26, 2007 at 12:47 PM
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E40WATER12
  • ✓Experienced Mechanic
  • 522 POSTS
Then you checked all the fuses, And they are ok, Then it narrows it down to youre fan relay switch, Its a little black box with wires coming from it to the fan wiring, near youre cars rad fan.
Jun 26, 2007 at 8:29 PM
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BPRICE443
  • MEMBER
  • 66 POSTS
Your scumatic diagram shows only one fan control relay and one 30amp fuse in the engine compartment. the same 30 amp fuse powers the fan motor and the relay. The computer turns the relay on when it knows the engines temps getting high from the sensor or when the a/c system pressures get high both are fed into the pcm first.
Jun 27, 2007 at 1:01 AM
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