1992 Gmc Sierra Car Over Heating Fan Seems Work Sometimes Doesn T This

1992 GMC SIERRA
300,000 MILES
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DEVELOPER7
  • MEMBER
  • 42 POSTS
I have a problem with my car over heating. The fan seems to work sometimes and sometimes it doesn't. I know this sounds crazy but it cools down when I turn on the air conditioner which makes no sense.
Nov 2, 2012 at 12:41 PM
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THIS IS MIKE
  • ✓Experienced Mechanic
  • 686 POSTS
When you turn on the AC, by default it turns the cooling fan on to make sure that air is pulled through the radiator and the condenser. Since the fan does come on we know that it works. Check your over temperature sensor it is probably not reading the temperature increase and is not signaling the fan to start operating.
Nov 2, 2012 at 12:55 PM
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DEVELOPER7
  • EXPERT
  • 42 POSTS
Thank you
Dec 22, 2012 at 5:23 PM
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