05 GMC Sierra Blower Issue

[sticknstring]

Blower fan has been intermittent lately. Won't come on when turned on, but will start after a few minutes on its own and sometimes will stay running after the ignition is turned off. Dual-climate auto control and all speeds are working when it actually works.

Is this a blower motor control module issue or likely just a wire harness short? From what I've gathered, I can tear apart the glovebox and locate the harness - is the control module there as well?

Thanks for any suggestions!

[Bjjams]

You might want to take it to a dealer to look at. GM put out a service bulletin a few months back for this issue. I have an 04 silverado and mine was covered under warranty. It's not a recall becasue if you don't have a problem they won't fix anything. How many miles on your truck? I believe it stated if it was under 150,000 miles it'll be covered.

[sticknstring]

125k. Interesting, anyone have any literature on this?

Just called the dealership and nothing came up under my VIN. Bummer.

He thought maybe a relay or resistor issue.

[Macgyver55]

It more than likely is the resistor. Read this prior thread for info, yours should be covered.

Quote:

Subject: 10240 - Special Coverage Adjustment - Heating, Ventilation, and Air Conditioning Blower Not Fully Functional or Inoperative

Models: 2003-2006 Chevrolet Avalanche, Suburban Tahoe

2003-2007 Chevrolet Silverado

2003-2006 GMC Yukon, Yukon XL

2003-2007 GMC Sierra

Prior thread dealing with similar problem

[Jeremy airjer W]

There is a panel under the passenger side of the dash. Remove the 3 fastners that hold it in place. Once out of the way you will see the blower motor resistor/module and the harness. Unplug the harness and see if the pins are burnt up. If they are replace the blower motor resistor/module and the pigtail (the connector). Both are available from the dealer and your local NAPA if you want to replace yourself.

It can't hurt to give your dealer a call and see if they will work with you on it as well but your mileage may be a little high.

[Bjjams]

FYI my truck had 130,000 on it and they fixed it by replacing the resistor.

[sticknstring]

Shop said it was the blower motor itself. Not good. Would the fan still function intermittently if the motor was bad? I wouldn't think it would turn on at all.

Thanks for the prior link with service bulletin info. Not sure why the dealer said there was nothing open on my rig.

[Jeremy airjer W]

That doesn't explain why it would not shut off!

[sticknstring]

Thanks for the help guys.

Replaced the motor and I've got air again. It's got a weird turbine sound when it comes on and the fan speed is adjusted, but it's cold! Will just have to turn up the radio a bit.

[Jeremy airjer W]

If it happens to "stick on" while your on vacation just look for the high blower fuse in the under hood fuse block (I'm pretty sure that's where it is). Pull it and the blower should stop. I believe the other lower speeds will continue to work with the fuse pulled.

Hopefully it will save you a dead battery.

[sticknstring]

Good call. I've been cycling the ignition to get it stop to save the battery. Hopefully I won't have that issue anymore. But if I do, I'll be looking for that fuse!