Blower Motor Won't Shut Off

[dpoul34]

Sorry about what must be a repetitive thread but all my search efforts drew blanks.

2003 GMC Envoy blower will not shut off when car is off. Even with the car running, the button can be on off and it still blows. So far I have had to pull the damn fuse (#35) under the hood to kill it as it drains the batter in no time flat.

Unfortunately, I need a quick fix as it's -5 degrees out and extremely unbearable. I'm headed to the dealer in a few hours and would love to be able to avoid the high charges there.

[Ray Dockrey]

If you have the manual AC controls then you need a new blower motor resistor. If you have the auto AC controls then you need a blower motor module. You may also need a new wiring connector depending on if the one you have is melted or scorched.

You can get to it behind the glove box.

[dpoul34]

Thanks Ray. Not sure what kind of AC control I have. I have the AC button and two sliders in the middle of the climate console.

[Ray Dockrey]

That would be manual so you need a new blower motor resistor.

[dpoul34]

You're absolutely right. Was the resistor. It seems when this was replaced a year ago by independent mechanic because the fan would only work on 1 & 2 but not 3,4,5, he installed an aftermarket resistor. GM mechanic found it to be faulty and on the verge of further burning. $186 to replace.

The funny side note to this is on the way to the dealer, the blower motor started working as it should!!!

Thanks for the input. Had I posted this yesterday when I detected the problem I could've done it myself and save the money. Forgot I was a member here.