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My engine is overheating?

Tiny
COOLRIDGEDUG
  • MEMBER
  • 2008 CHEVROLET UPLANDER
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 200,000 MILES
Overheating. Temperature sensor located in head has been replaced and relays exchanged for known good ones. High speed and low speed fans both work when wired directly. When van gets hot high speed fans not coming on. I also swapped the Ecm with a parts van I have and no change in the issue. Where is the sensor for the high speed fans located? Thanks
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Monday, April 3rd, 2017 AT 12:40 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,397 POSTS
Hello,

There is three fan relay's that control the system, either one has gone out or you have a wiring problem here is a wiring diagram and a guide to help you fix the problem.

https://www.2carpros.com/articles/how-to-check-wiring

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please run some tests and get back to us so we can continue helping you.

Best, Ken

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Thursday, April 6th, 2017 AT 4:19 PM

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