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How to Replace Blower Motor Resistor 2003-06 GMC Sierra 2500 HD
Created on:
Tools used
Socket Extensions
7mm Socket
Ratchet
7/32 Inch Socket
1. access the resistor
Remove the four bolts under the glove compartment.
Use your 7mm socket and driver
2. remove the resistor
Unplug the resistor from the harness.
Remove the four bolts securing the cover next to the resistor and unplug the remaining harness.
Unbolt the now unplugged resistor and remove it.
3. Install new resistor
Use your wrench to bolt it back in.
Plug everything back in, unbolting the cover obstructing the second harness again if necessary.
Test and replace the panel.
Brought to you by 1AAuto.com-- your source for quality replacement parts and the best service on the internet.
Hi, I'm Mike Green. I'm one of the owners of 1A Auto. I want to help you save time and money repairing and maintaining your vehicle. I'm going to use my 20+ years experience restoring and repairing cars and trucks like this to show you the correct way to install parts from 1AAuto.com. The right parts installed correctly- that's going to save you time and money. Thank you and enjoy the video.
In this video we're going to replace the blower motor resister on this 2002 GMC Sierra. This procedure is the same for pretty much any GMC or Chevy truck and SUV with this body style with the manual air conditioning controls. You'll need two sockets, a 7 mm and a 7/32 standard size socket and a ratchet and an extension.
A common problem with these trucks is, you can see with my system is on, I only get fan on the four and five positions. On the passenger side, there are four, 7mm bolts to remove, one there, one in there, there's one up in that hole right there, can't really video it and then over here closer to the gas pedal. There's one right there and once you remove those bolts, just reach in and kind of pull it down and out of the way. Just put your thumb in there and disconnect your harness. All the harness is, is a little tab right here that you need to pull back. This tab right here. That's up in there, pull that back and then down.
Now you're going to remove four bolts. You're going to remove two here that hold the resistor in, then you're going to remove two that hold this fan cover here. There's one here and then there's one opposite of that; that I really can't film. Once you have this cover loose, what you're going to fight to do is get a finger in there to press on the tab. This is what locks in there. Basically you have to reach in there and press right on this to unlock it and then pull it out, so that's what I'm trying to do there.
Maybe if you have smaller fingers you won't need to loosen this up, but I did, so I'm actually going to bolt this back up. We can take this out now. Here is my old resistor out. Here's the new resistor from 1A Auto. You can see it's pretty much the same. It's all going in there the same, the resistor itself, is a little different from the circuit board, but it will go right up in there. I have this snug. I'm going to put this up in there and pretty much by feel, reconnect it. It's not too difficult. Now I'll reconnect my harness. Just a quick note here, I did have to turn that connector around. Just the resistor from 1A Auto was just turned 180 degrees, so you just flip it around and it just plugged right in. Turn the key on and you can hear it already working on three, you can hear it working on two and one. Now I have all five speeds. Now we'll just put this bolt up in here. Just put in the most difficult part of the operation. Tighten that up.
The final part is put your cover back in place. You want to push it up in there, you push it up next to the firewall first and I'm sorry for shaking around a little bit here. I'm just trying to film with one hand and trying to push it up with another. Push it up and in first and then make sure you have everything lined up. As you can see here those are the passenger side outlet holes. Make sure those are all wound up, then start your end bolt here and then I recommend starting the one next to the driver side. Once you have those lined up, the other two middle ones go in pretty easily.
We hope this helps you out. Brought to you by www.1AAuto.com-- your source for quality replacement parts and the best service on the internet. Please feel free to call us toll free, 888-844-3393, where the company is here for you, on the internet and in person.
HCA41498
In Stock
Product Reviews
4.8/ 5
★★★★★★★★★★
67 reviews
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87%
4★
10%
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★★★★★February 2, 2026
Blower Motor Resistor
Great Fit, The plug was rusted and had shorted out. The video on A1 auto had highlighted that problem. I contacted customer service and they promptly sent me the part number and I was able to order it and get it installed in a week. Thank you A1 Auto for your products and videos.
★★★★★October 16, 2025
Worked perfectly. The instruction video was also a great help.
Thank you!
★★★★★June 3, 2025
Don't Waste Time!
As advertised - perfect replacement. Great prices, quick shipping and first rate customer service.
★★★★★March 13, 2025
Easy to install after watch the video on 1A Auto!
★★★★★October 27, 2024
Fan works
Everything worked the way it was supposed to. Now I have heat.
★★★★★December 14, 2023
Order again from here
Shipped right away had it in 2 days. Fits, works, excellent part now we are warm
★★★★★September 11, 2023
Works good,didn't directly bolt up how I wanted,I made it work.
★★★★★August 23, 2023
Works great
★★★★★June 8, 2023
Good inexpensive fix
Easy swap with plug and play and matched up with my 2002 Chevy Silverado 1500. Corrected the problem with each fan speed now working. High position not as strong as I thought it should be but overall a quality fix at reasonable price. Fast processing and shipping
★★★★★May 29, 2023
Blower Motor Resistor was the perfect choice.
Purchased this Blowier Motor Resistor with a Heater Blower Mother for my 2006 Silverado. They were a perfect match for my heater system.
Showing 1–10 of 67 reviews
Customer Q&A
Got a question about this part? Post it and get answers from our team.
CharlesNovember 30, 2023
Does this work with a 2005 suburban 1500 manual temp ?
As long as yours has the 2-hole mounting flange design then yes, this will be a fit!
T · December 6, 2023
PedroJanuary 24, 2021
My blower motor resistor pin connection is angled to the corner of resister. Hence my mounting flange opening is angled to the corner as well, will this part 1AHBR00009 with mounting flange fit my 2 bolt on a 2004 chevy silverado V6 4.3L?
This item is listed to fit the 2004 Chevrolet Silverado 1500 with 2 Hole Mounting Flange with Manual Temperature Control.
Jessica · January 26, 2021
RogerDecember 5, 2017
My blower motor plug in has melted where it plugs into the blower motor, this is the 2nd harness to melt, would the resistor be putting to many amps into the blower motor and melting the harness to where it won't work?
Blower module
T · September 10, 2018
D_windexJune 25, 2017
What should the resistance, or on reading be?
Just as good as stick
J · December 22, 2020
DMay 1, 2017
My AC is not blowing on the High speed, It will fluctuate on speeds based off the RPM of the engine is going, for example, when I stop at a light, the AC fan speed will sputter. The AC is not working reliably, at times It will not turn on at all. Is
That's basically what mine was doing. 1,2,3, fan speeds were not there. Only 4 and 5. Driving on highway upped them slightly. Putting this new part in was easy and did the trick. Now, all speeds work as they should.
G · October 11, 2018
Showing 1–5 of 5 questions
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