Question about 2003 GMC Envoy
You have fuses and relays for the fan speed. It has a low and high speed each with thier own fuses and relays. I would start there. They are located under the hood in the fuse/ relay junction block.
Also the fans are controlled by the ecm computer and the engine coolant temperture sensor. Along with the air conditioning system. It is possible to have one of the fans short out and not make any noise. you can check the fans by spinning them, if one seems to drag it is going out. If you can move them in and out from the motor they are going bad. Let me know.
Posted on Nov 10, 2010
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Posted on Jan 02, 2017
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