Question about GMC Sierra
AC works, fan speeds 1,2,3 do not work 4 &5 work on AC, but no heat, so I have a dual problem? Winter is arriving and I need heat. Help!
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Posted on Jan 02, 2017
Call your local GMC Dealer and see if they have the climate control panel in stock. What happens is the circuit board on the back of the panel shorts out. The panel comes as an assembly and is very easy to replace. Don't go with a wrecking yard piece. I made that mistake once and it didn't work either. I got one from the Chevy dealer and it worked perfectly.
Posted on Aug 21, 2008
you need a resister found under your air duct by the passenger floor under dash board auto zone sells these for about 25.00 you may as well buy cabin air filters while your at it . 1 of the screws will be a pain to install back into the duct work I left mine out didn,t make a difference . you might have to order it as they are a comman item oh you will need a vacuum to clean up mess from cabin air filters .this is not a hard job .
Posted on Feb 28, 2009
SOURCE: 03 GMC Envoy: AC/Heat fan
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)
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:
I hope this helps!
Posted on Nov 04, 2009
The switch or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Sierra running 100% again soon.
Posted on Jan 06, 2010
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