My engine is overheating?

2008 CHEVROLET UPLANDER
200,000 MILES • 6 CYL • FWD • AUTOMATIC
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COOLRIDGEDUG
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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
Apr 3, 2017 at 12:40 PM
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STRAILER
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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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Apr 6, 2017 at 4:19 PM