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2000 GMC Sierra 1500 no heat, AC works, fan speeds 1,2,3 inoperative, speeds 4&5 work so far. But NO heat.

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!

Posted by Anonymous on

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Posted on Jan 02, 2017

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leetamara
  • 702 Answers

SOURCE: Fan speed switch only works on #5

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

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  • 11 Answers

SOURCE: Heater/ac switch speeds 1 and 2 don not work in 99 Silverado

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

  • 3287 Answers

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) 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!

Posted on Nov 04, 2009

Molson02536
  • 3854 Answers

SOURCE: 2004 GMC Sierra 4dr truck. the fan does not work

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

  • 326 Answers

SOURCE: 2004 gmc dual ac, driver side vents shift from ac

bad blend door actuator maybe there is way to press the buttons on controller to make doors recenter they call it

Posted on Mar 22, 2010

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1 Answer

I Have an 03 gmc sierra 2500hd. the problem is the manual speed control knob for the heat/ac only work at the highiest setting. all of the lower speed controls don't work. What do you think is the problem?


there is a resister near the blower motor that controls the fan speeds that is most likely your problem when it goes bad the blower motor will only work on high i have changed many of them on many cars & trucks

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2001 GMC Sierra 1500 fan is only working on 4 & 5 & the heater control is working intermittently.


The blower and temperature controls are independent if you have the manual system but they are integrated in the control head for the automatic version. The automatic version does not include a set of resistors. Do you know which system you have? If you have manual controls, I recommend you test the resistor with an ohmmeter. It's possible that your blend door actuator and resistor have failed independently. However, if you have the automatic system, your theory is as good as any. By the way, your wiring diagrams are available on autozone.com--they include both manual and automatic system schematics.

Jun 26, 2017 | GMC Cars & Trucks

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2005 gmc sierra heater fan quit working. I lost the fifth speed months ago and a couple of days ago lost the other four, the first day the fan would come on sometimes while driving then quit after a while...


1-4 speed are the blower motor resister . It controls all 1-4 speeds, also it's under the passanger side dash around fan, the 5th speed runs off a fuse the is located in the fuse box. It's one of those square fuses , not the relays but fuses. The resister will run $15 and fuse $5 . Good luck. I have replace these before

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Diagram of fireing oder of 4.3 V6 1996 chevy


Posted by original Asker under 2000 GMC New Sierra 1500 for a 1996 Chevy 4.3L V6

For the 1996 Chevy 4.3L V6:

Firing Order
:
1-6-5-4-3-2

Cylinders:
........(back).......
|..6..|.......|..5..|
|..4..|.......|..3..|
|..2..|.......|..1..|
......(front)

Distributor Connections:
...........(back)
Coil-> o
6-----> o.......o <-----5
4-----> o.......o <-----1
2-----> o.......o <-----3
...........(front)

Let me now if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

Jun 20, 2010 | 2000 GMC New Sierra 1500

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My blower fan only works on high


you will need to order a blower resister its easy to swap out

Dec 11, 2009 | 2000 GMC Sierra

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Heater fan only works on 5


YOU NEED TO REPLACE THE BLOWER MOTOR SPEED CONTROL RESISTOR.

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Fan speed switch only works on #5


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.

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