Hi i have an 03 gmc sierra and today i started my truck drove around came home turned the truck off and the heater motor kept blowing.Truck shut off no keys in ignition and the fan keeps blowing.I started it to see if something was stuck,hit the fan speed all the way down and hit the power button and it still won't shut off? Any solutions?

 

Check and see if there is a fuse for the blower motor and pull it for the time being...sounds like there's a short somewhere or possibly a connector/junction block that has gotten moisture in it.

 

it'll eventually shut off.


got jumper cables?