Question about 2003 GMC Envoy

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I have a 2003 GMC Envoy with manual heater control. The blower only works on the highest (5) setting.

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Most likely the resistor pack has failed. It still works on high because high bypasses the resistor.

Posted on Dec 30, 2010

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Related Questions:

1 Answer

Heater fan motor only works on highest 2 speeds. need to know where the fan resister is?


The resistor pack is located behind the glovebox, mounted to the blower motor.

Nov 15, 2010 | 2003 GMC Envoy

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do you have the manual.

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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 picturepepsiman1967.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

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2 Answers

2003 GMC envoy heater fan motor will only work on high setting


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Dec 16, 2009 | 2003 GMC Envoy Xl

1 Answer

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Nov 14, 2009 | 2003 GMC Envoy Xl

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The blower speed switch only works on 5. The


this problem is caused by a defective blower speed control resistor, it is located near the blower motor, very cheap to replace, part is around $35

Oct 26, 2009 | 2002 GMC Envoy

2 Answers

Blower motor continues to run when vehicle is off


Your problem is the Relay which is encased inside the Heater/AC Resistor Module. This is a very common problem with GMC and Chevy Trucks. The Relay's return spring fails and the relay is held closed by gravity. The only fix is to replace the Resistor Module. I have a 2004 Silverado and have replaced the Module 3 times and the Blower Motor twice. The Orange wire feeding the Module is always Hot (12V) and feeds the Relay Contact for Highest Blower Speed. Hence the Blower runs all the time even with the Key off and removed.

Oct 02, 2009 | 2003 GMC Envoy Xl

2 Answers

Envoy Resister


no resister on this car. the a/c comtrole is a module. comtrol the blower. frist check the connetor for the blower. if is ok replace the controler. price for $ 200.00 call the deler

Apr 17, 2009 | 2004 GMC Envoy

1 Answer

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

1 Answer

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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