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Temperature gauge is fluctuating

Tiny
DALE BIGGS
  • MEMBER
  • 1997 CHEVROLET MONTE CARLO
  • 146,000 MILES
On the fans the cools the engine, are they wired in series for the a/c, and in parallel for cooling the engine?The reason I am asking this is because my temp gauge is all over the place, and when my fans come on they both run, but to seems like they aren't speeding fast enough to cool the engine like they should, I know both of them are suppose to come on at the same time, I am just thinking do they run in series with each other with the a/c on then in parallel to cool the engine down.
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Thursday, October 6th, 2011 AT 8:50 PM

5 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
The fan is coming on and still not cooling the engine
Check coolant level and suspect bad thermostat
you have hi and low speed relays
you can check them too
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Thursday, October 6th, 2011 AT 8:57 PM
Tiny
DALE BIGGS
  • MEMBER
  • 3 POSTS
Replaced the t stat, coolent level, good, I don't know if there's and hi and low relays
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Thursday, October 6th, 2011 AT 9:04 PM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
If running hot all the time
Check manifold gasket if leaking and if the head gasket is at fault
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Thursday, October 6th, 2011 AT 9:07 PM
Tiny
DALE BIGGS
  • MEMBER
  • 3 POSTS
It's not running hot at all times, the temp guage is all over, did a fresh valve job on it, I and just noticed when the coolent fans come on that they are not at a higher speed that you would thing they should be.
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Thursday, October 6th, 2011 AT 9:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
You may have relay issue. No, they aren't wired in a series. Actually, with the AC on, only one fan should run if the engine isn't too hot.
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Sunday, October 9th, 2011 AT 4:27 AM

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