Question about 2004 GMC Envoy

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03 GMC Envoy: AC/Heat fan will not work on the 1 or 5 settings. Thanks, ttfn AC will only work on settings 4 and 5.

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Replace switch.

Posted on May 22, 2009

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03 GMC Envoy: AC/Heat fan will not work on the 1 or 5 settings. Thanks, ttfn


This is usually caused by a failing fan motor resistor pack. The resistors allow changes the speed of the fan. If one or more fail, certain speed(s) become unavailable.

Auto Zone sell the blower motor resistor pack for the manually controlled fan speed for $28 (they may also have the automatic or climate control types, too). I did this job myself in my '04 Envoy in less than 30 minutes with a flashlight and a few simple hand tools. You might have to get into a slightly awkward position to see & remove / reinstall the screws that hold the resistor pack in place under the dashboard however.

1) Remove the two screws from the plastic cover under the glove box & disconnect / remove electrical connectors secured to the cover. Set the cover aside.

2) Empty the glove box of the contents.

3) With the glove box open, push the clip on rear of the left side of the glove box towards the firewall to allow it to fall forward.

4) Remove the electrical connector from the blower motor located to the right of the glove box opening.

5) Pull the connector and cable downward tot he floor. There is a thick rubber band that may be holding the cable - pull it away to slide the cable out easily.

6) Close the glove box.

7) Look upward - close to the firewall to follow the cable removed in a previous step (a flashlight can help out here). It enters a plastic part held in place with two screws. There is also a narrow electrical connector on this plastic part.

8) Disconnect the narrow electric connector by pulling it straight downward.

9) Remove the two screws that hold the plastic part in place.

10) Allow the part to fall / gently pry away from surface.

11) Reinstall in reverse order.

Check with the store first to make sure this part is compatible with your model year vehicle - the part is Duralast #DR755 shown below:

http://www.autozone.com/autozone/catalog/parts/partsShelf.jsp?categoryDisplayName=Climate+Control&fromType=parts&fromString=search&parentId=52-0&currentPage=1&filterByKeyWord=dr755&isSearchByPartNumber=true&navValue=15201160&categoryNValue=15299999&fromWhere=&itemId=1160-0&displayName=Blower+Motor+Resistor&searchText=dr755


I hope this helps!

Aug 01, 2008 | GMC Envoy Cars & Trucks

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