Question about 2004 GMC Envoy

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Heater on my envoy only works on 3-4 setting, could that be the switch.

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Thanks for the opportunity to let me help. The blower control switch in your vehicle also uses a blower relay. This relay is generally located on the firewall on the passenger side near the heater fan. You can also look in you vehicle owners manual for the location of the blower relay, it may be also be located in the fuse and relay box under the hood. Generally speaking if the highest setting doesn't work on a GM vehicle it is a high blower Relay. This item is not expensive and can be purchased at most all you local Auto parts stores. If you have a Napa, Orielly's, or AutoZone these stores will also likely help you in the location if you are unable to locate this relay. Here is a general pictureheater on my envoy only - pepsiman1967.jpg The installation of this relay is either to remove from the fuse box, or if located near the heater fan housing then you will need to remove the mounting screws, remove the wiring clip, then reverse to install. I hope that this has helped you. D.R. Wilkins

Posted on Nov 05, 2010

  • Freddy Dec 19, 2010

    If the fan is working on 3 -4 settings the problem is not the a relay, and I don't believe the Envoy uses a relay.

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The fan speed is controlled by the blower motor resistor. Here is a helpful site. Be mindful there are two different blower motor resistors; one for manual control and one for automatic speed control.

http://www.sparkys-answers.com/2009/01/2002-gmc-envoy-no-low-blower-speeds.html

Posted on Nov 05, 2010

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Replace blower motor ressistor check wireing harnnes gm had a problem

Posted on Mar 01, 2013

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  • 17 Answers

Yes

Posted on Nov 05, 2010

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2003 GMC Envoy lower 3 heater fan settings quit working.

had same problem on my XUV. changed the blower motor resistor, located under passenger side dash. easy to change, works no problem.

Posted on Feb 17, 2009

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Dec 30, 2010 | 2003 GMC Envoy

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Either the switch or the resistors on the blower. Get shop manual remove switch and jump terminals the manual tells you to do to check switch. If a-ok then do checks for the resitor on the blower motor. Hopefully its the switch.
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2003 GMC Envoy lower 3 heater fan settings quit working.


had same problem on my XUV. changed the blower motor resistor, located under passenger side dash. easy to change, works no problem.

Jan 20, 2009 | 2003 GMC Envoy

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Jan 20, 2009 | 2003 GMC Envoy

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2002 GMC Envoy


Sounds like the blower motor resister to me this piece controls the speeds of the blower motor it should be close to the blower motor on the passenger side it should have wires going to the blower motor very easy to replace.

Jan 08, 2009 | 2002 GMC Envoy

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