Having problems with your 2003 GMC Sierra 1500 ?

The truck's heat fan will stay on at all times and the truck will also loose power while running until it shuts off.

Posted / edited by AnonymousUser on : 20-05-2019

Answers :

The blower motor has a resistor, relay assembly that shorts out on these trucks. I have an 2006 chevy 1500 that had the fan start runnuing all the time too.
\015\012You'll find the resistor, relay assembly under the dash on the passenger side. It's about the size of a pack of cigarettes and it's pretty easy to replace. First, remove the plastic cover under the dash and you'll see the wiring harness with several wires that connects to it and the black and red wires that go from it to the blower motor. The wiring harness should be replaced as well. Make sure to disconnect the battery before working on it so you don't short anything else out.
\015\012Sometimes these things melt and catch fire so it should be fixed as soon as you can.
Repair Help & Product Troubleshooting for 2003 GMC Sierra 1500

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