blower motor runs after truck and unit are off

[BigDumbDually]

my blower motor runs after i shut down the vent control.. 03 diesel..the stupid digital dual zone setup..i can only shut it down by pulling the relay from under the hood....any ideas?

[Weasel Diesel]

If you put the relay back in and it is not blowing, then the contacts in it are burnt and you need to replace the relay .... it is sticking.

[DuramaxBoy]

Sounds like you have a short to ground after the blower motor. I believe the blower motor ground is through the resistor on that one.

[jcline]

I think that DuramaxBoy is right. They updated those resistores in 04 or 05 and they are common for shorting out. Easy to change under glove box.

[BigDumbDually]

it shuts off when the relay is removed...i tried a new relay and there was no change, it still runs when the truck is off....i took apart the dash and removed the climate control, un-plugged the two rear wire plugs, and the blower still runs....is there a vac operated switch? when i removed the blower fuse and the ac fuse from the panel inside the truck the blower still runs with no fuse...only shuts when relay is pulled...any ideas?

[BigDumbDually]

do i buy the resistor at the dealer? or do parts stores carry them