Question about 2002 GMC Sierra

2 Answers

Fan speed switch only works on #5

I have a strange problem with the climate control in my GMC 1500. The fan control does not work for speeds 1-4 but works fine on the highest setting of 5. The AC works fine and the air is cold on 5 plus I can feel cold air passively flowing when I have it on fan setting 1-4. There is also no fan motor noise on setting 1-4. Is this an indication of a malfunctioning switch (speed control)?

Thanks

Posted by on

  • 1 more comment 
  • Anonymous Sep 18, 2008

    Mine is a 2003.But it does the same exact thing.

  • Anonymous Mar 17, 2014

    Has climate control. Selector has auto ,1,2&3. No matter where it is set in any of those positions it may come on or may not. When it comes on will work at all speeds, when not it doesnt work at any speed setting.

  • Anonymous Mar 25, 2014

    no air flow at any speed

×

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 702 Answers

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

It most likely the speed control resistors, it is a modual that is attached to the air intake duct to keep it coil. On any of the lower speeds the current passes through the resistors and reduces the voltage to the blower motor. On #5 or the highest speed the resistor modual is bypassed.

Posted on Aug 30, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Why does my high speed #5 not work on my climate control on my 2003 GMC Envoy


The hi speed is controlled by the fan relay located in the under hood fuse block. It isn't working.

May 16, 2014 | 2003 GMC Envoy

1 Answer

The fan in my 2002 GMC Savana cargo van doesn't work. I lost low, then medium speed, and finally the high speed.I checked the fuses and relays.I changed the blower resister, still no fan. The heat


Hi Jim, If the vehicle is fitted with climate control it will have electronic management. However it can be wired by someone knowing electrical circuitry to by pass the control. It will save you some cash but will need manual control. Make sure whoever does the job knows what he or she is doing. Have a happy new year. Regards John

Dec 31, 2012 | 2002 GMC Savana

1 Answer

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

Jan 03, 2011 | 2003 GMC Sierra 1500

3 Answers

Heater fan only works on the high position?


There is a plug up under the glove box that loosens and you need to snug it up.

Dec 09, 2009 | 2004 GMC Canyon

1 Answer

Climate control low speed fan no longer works


If your only getting high speed, that's a good indicator resistor is going or gone.

Aug 08, 2009 | 2003 GMC Sierra 1500

1 Answer

My climate control turns off on fan speed #5 all other fan speeds works fine I got an 2005 silverado


in some of my experience with other makes it has been the blower motor resistor sounds very similar to what you have going on

Apr 28, 2009 | 2005 Chevrolet Silverado 1500 2WD

1 Answer

A/c heater climat control switch


Check the relais module located inside under the rh side of the heather box you can see the connector most of them need to be replaced as they burn out you may need to replace the blower motor as well,high amp draw caused by faulty bearings will overload the blower motor controller

Jan 16, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab

Not finding what you are looking for?
2002 GMC Sierra Logo

1,052 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

61037 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...