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04 Suburban blower resistor ? - Printable Version

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04 Suburban blower resistor ? - texasdad - 11-25-2013 01:11 PM

I have a 2004 Chevy Suburban with dual AC system, front and back.
The back air/heat/blower system works fine.
The front system, the air blower was working on positions 1 2 3 4 5 and blowing air just fine. Then gradually, positions started to fail, first 1 then 2 all the way to 4. Finally, one day position 5 that was the only one working for a while, gave up too, and now there is no air coming from the vents, besides just a slight hint of air when traveling on a highway.. With the engine running, and listening carefully, if i progressively switch from 1 to 2 and then keep going, I hear nothing, until i switch from 4 to 5. At that point I hear a "click" like a relay or something. But still, no air. Have I blown the blower, the resistor or what ? Is this something simple enough for a DIY or should I go to a dealer ? ( ugh...) Sad

" ..Okay, she won't be winning any beauty contests anytime soon. But she's solid. Ship like this, be with ya 'til the day you die.."

RE: 04 Suburban blower resistor ? - Rupe - 11-25-2013 07:40 PM

Yeah, sounds like the blower resistor and the click you hear is the "high blow" relay. You can access the resistor by looking under the dash where the passenger's feet would be. On the bottom of the black box the round part is the blower motor and right near there is the 5-6 wire plug for the resistor. If you pull the big plug and see the terminals are burned there's a repair harness available from the dealer you can splice in. The new harness has heavier wire to prevent heat build up near the terminal end. No fancy tools needed, just crimp pliers and electrical tape... maybe a zip tie for the harness. I can't recall if the resistor snaps into place or has two screws. It will be obvious once you locate it.

RE: 04 Suburban blower resistor ? - Rupe - 11-25-2013 10:21 PM

BTW, forgot to mention that sometimes the cause of the resistor going bad is an aging blower motor, especially if that harness plug is burned. (high current draw) If there's any hint of the blower being on it's last legs you should replace that too. Signs might include odd noise at low speed when it's cold out, slow starting when cold, or unusual vibration. I don't believe you need any tools to take the blower out. If you look closely there's a series of plastic tabs that hold it in place. Just grasp the round part with two hands and give it a twist. After about an inch or so of movement it will drop right out.

RE: 04 Suburban blower resistor ? - texasdad - 11-26-2013 01:26 AM


thank you for you reply and assistance. My wife just came home with the Suburban, and I looked at the front passenger area and saw that the black plastic section is held up by two screws or something of that nature ( did not have a flashlight on hand ) so tomorrow with daylight , tools, and proper light I will remove the black plastic cover, see what is behind it, and following your directions see what I can come up with. If I get "stuck" I will re-post with pictures..

Thanks again for your courteous help ! I really appreciated it !


" Wash: This landing is gonna get pretty interesting.."

RE: 04 Suburban blower resistor ? - Rupe - 11-26-2013 10:57 AM

I forgot the passenger (Suburban) version probably has a trim panel to be removed. The last one I did was 3500 dually so more bare bones on the interior. Once you locate the blower motor just follow the black and red wires about 8 inches to the blower resistor. You will need to unplug that pig tail from the motor to pull the resistor.

BTW, the dealer repair harness is about a foot long. You don't have to use it all. I prefer to stagger my splices about 2 inches apart so when it's all done I can tape it into a neat bundle. Do one wire at a time because the replacement is not color coded. When all done and working you can secure the slack with a zip tie to the other harness so nobody will kick it in the future.

RE: 04 Suburban blower resistor ? - texasdad - 11-26-2013 11:17 AM

Thanks again, Rupe. Your info and details are very helpful.
I will let you know how it went.