1994 Pontiac Sunbird Cooling Fan Always On

Tiny
PROFESSORCHAOS96
  • MEMBER
  • 1994 PONTIAC SUNBIRD
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 280,000 MILES
My cooling fan is running almost constantly, even though it's -20 degrees outside. My temperature hand reads normal (though slightly lower now though due to the fan). Now to my understanding there are two relays which activate the fan, one being the coolant temperature sensor, and the other having to do with the A/C. My car did come factory with air conditioning, though it hasn't worked in quite a while, and I have the compressor and the rest of the system removed from the engine compartment. No lights are on in the dash at this time.

Now correct me if I'm wrong, but if either relay is causing the fan to run, then removing or unplugging the culprit should shut it off. I know the location of the coolant sensor (on the left side of the cylinder head) but I'm not sure about the one concerning the A/C. One other thing I have in mind is that I know the radiator has transmission cooler lines, so could it be possible the transmission may be running hot as well?

If you guys could tell me the location of that A/C sensor, or offer any other troubleshooting tips and/or a wiring diagram for the cooling fan, it would be greatly appreciated. Thank you for the help guys, and Happy New Year!
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Saturday, January 2nd, 2010 AT 5:06 PM

4 Replies

Tiny
RASMATAZ
  • MEMBER
Give me your email addy all the info you're looking for is in the EWD-also test the resistances of the CTS hot and cold
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Saturday, January 2nd, 2010 AT 5:24 PM
Tiny
PROFESSORCHAOS96
  • MEMBER
My email is professorchaos96@hotmail. Com, thanks for the quick response!
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Saturday, January 2nd, 2010 AT 5:26 PM
Tiny
RASMATAZ
  • MEMBER
Just sent it a few mins. Ago
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Saturday, January 2nd, 2010 AT 5:38 PM
Tiny
PROFESSORCHAOS96
  • MEMBER
Just a follow up, I replaced the coolant fan relay, and the problem seems to be rectified. I guess the internal contacts were corroded and stuck on. Thanks again for the diagrams!
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Friday, January 8th, 2010 AT 7:33 AM

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