gmc forums   gmc forums
Go Back   GMC Forums > GMC Vehicles Currently In Production > GMC Sierra Forum

GMC Sierra Forum Forum for discussions regarding the GMC Sierra

ATTENTION: We're looking for moderators. Is anyone interested?
GMC Forum: blower not working on 5
Thread Tools
Old 11-19-2009, 01:49 PM
gm-lm gm-lm is offline
Junior Member
Join Date: Nov 2009
Posts: 1
Cool blower not working on 5

my blower motor quit working on #5 then #4 can anyone help?
Reply With Quote

Old 01-21-2010, 01:39 AM
4_3_beast 4_3_beast is offline
Junior Member
Join Date: Jan 2010
Posts: 27

Heh... I feel you blower on my '05 only works on 5! lol
Reply With Quote
Old 01-21-2010, 01:27 PM
Molson02536 Molson02536 is offline
Senior Member
Join Date: Dec 2009
Location: K/W Ontario Canada
Posts: 3,098
Send a message via AIM to Molson02536 Send a message via Yahoo to Molson02536

Good chance that the blower motor speed resistor needs to be replaced and the high speed blower relay has gone bad. GM has a kit to replace the speed resistor and the wire harness for the blower motor which is common for it to burn out or short out. Good luck and keep us posted.

You need to replace the Resistor's wiring harness too. GM Tech Bulletin on that. The resistor causes a overheat condition and the stock harness is not the proper AWG, and it causes the wires to melt.

Go purchase this part number # 15862656. The bad part is, it's a GM only part number and they retail at $95.00.

Here is a copy of it, notice, it says to repair the connector at the resistor.
A/C - Blower Motor Inop. or Works On Low Speed Only

Bulletin No.: 05-01-38-012C

Date: November 02, 2006

EI05082 - Loss of Blower Motor Speeds Except for Low Speed or Inoperative (Replace Blower Motor Resistor and Resistor Module Connector)
2004-2006 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer, TrailBlazer EXT
2007 Chevrolet Silverado (Classic) Built Prior to September 1, 2006
2004-2006 GMC Envoy, Envoy XL, Sierra, Yukon, Yukon Denali, Yukon XL
2007 GMC Sierra (Classic) Built Prior to September 1, 2006

with HVAC System AC Front, Manual Temp Control (RPO CJ3) or Heater Only (RPO C42)


This bulletin is being revised to clarify the Warranty Information. Please discard Corporate Bulletin Number 05-01-38-012B (Section 01 - HVAC).

This bulletin is being revised to clarify the Warranty Information. Please discard Corporate Bulletin Number 05-01-38-012B (Section 01 - HVAC).


Some customers may comment that the blower will only work on low speeds or has become inoperative.



Replace the blower motor resistor and module connector using the following procedure:

Remove the blower fuse.

Fullsize Trucks and Utility Vehicles - Htr A/C & HVAC 1 fuses

Midsize Utility Vehicles - Blower Fuse 35 located in the Underhood Fuse Block

Lower the hush panel or close-out panel enough to gain access to the resistor module connector.

Disconnect the connector from the resistor module.

Remove the tape from the wiring harness to expose the wiring.

Cut the wires back far enough from the connector to eliminate any melted insulation on the wire.


Use the old connector as a map for splicing the wires for the new connector. Be sure to use the correct crimping tool from the terminal repair kit J 38125. Use only Duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection.

Install the new connector. Use the yellow splice sleeves provided with the connector.

Install new blower motor resistor.

Reinstall the fuse or connector block. Test the blower motor to make sure all speeds are functional.

Reinstall the hush panel/close-out panel.
Reply With Quote
Old 01-27-2011, 01:29 PM
03Yukon 03Yukon is offline
Junior Member
Join Date: Jan 2011
Location: Missouri
Posts: 4

Where is the hush panel/close-out panel?
Reply With Quote
Old 01-27-2011, 04:21 PM
GM-GUY GM-GUY is offline
Junior Member
Join Date: Jan 2011
Posts: 4

If it's like my 01 Chevy, passenger side, under the dash (the cabin air filter area). You should see a wire harness (6 pin flat) - that connects to the board in question.
Reply With Quote
Old 01-28-2011, 09:57 AM
2001 GMC Sierra 2001 GMC Sierra is offline
Junior Member
Join Date: Dec 2010
Posts: 21

GM-GUY, thanks for the information. My '01 has only lost position #1 so far... Ron
Reply With Quote
Old 01-30-2011, 11:25 AM
GM-GUY GM-GUY is offline
Junior Member
Join Date: Jan 2011
Posts: 4

When mine burned out, it burned in such a way as to make the blower RUN on #5 all night - it drained the batteries.

So be aware, it can burn in such a way as to make it so it won't work, or in such a way to make it work even with the enge off and key out.
Reply With Quote
Old 02-21-2011, 04:52 PM
hollywoodslkpkup hollywoodslkpkup is offline
Junior Member
Join Date: Feb 2011
Location: ohio
Posts: 3

its the climate control box....
Reply With Quote
Old 12-14-2011, 01:20 PM
wfink wfink is offline
Junior Member
Join Date: Dec 2011
Posts: 1
Default What Now

My blower stoped operation in all speeds. I replaced the blower resister and the terminal, now speed 1 - 4 are once again operational. But 5 still is not functioning. Does any one have any suggestions.
Reply With Quote
Old 02-29-2012, 01:02 PM
lgranger lgranger is offline
Junior Member
Join Date: Feb 2012
Posts: 1

If 1-4 work and 5 doesn't, check the 30 amp fuse (thats what it is on my 2001) under the hood in the fuse panel (Climate Control fuse). 5 is the only speed that is affected if that fuse is blown. If any of the 1-4 speeds don't work, it is most likely the resistor. If the fuse is blown, simply replace it and you should have all speeds. If the fuse is good, and you still have no 5, the problem is probably in the switch or the wiring. It is likely NOT the blower motor itself. 4 and 5 not working at the same time is likely two different problems, and most likely the resistor and the fuse. Hope this helps.
Reply With Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 04:13 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2014, vBulletin Solutions, Inc. recognizes that "GMC", it's logos and various model names and numbers are registered trademarks of the General Motors Corporation. These terms are used for identification purposes only. is not affiliated in any way with the General Motors Corporation, GMC or any other company listed herein. All information on this site is the opinion of its members and not the opinion of the site itself. 2014 Madison Ross Media Group. All rights reserved. Content published on requires permission for reprint.
Need products for your GMC Truck? Check out your options at the links below:

No special deals available at this time...