Blower motor not turning off

2004 PONTIAC GRAND PRIX
211,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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WHITNEY MALLORY
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  • 3 POSTS
A/C heater blower motor won't turn off unless you pull 30 amp fuse.
Aug 7, 2020 at 5:05 PM
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STEVE W.
  • ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
That sounds like the blower motor controller has failed or the control head has failed in a way to tell the blower to stay on. The control module is mounted under the dash on the right side next to the blower motor itself. To access it you remove the trim panel under the dash and the module will be held on with 2 melted plastic blobs and the wiring connection. You cut the plastic blobs off to remove the module, then the new one uses screws in the holes to secure it.
Aug 7, 2020 at 9:14 PM
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WHITNEY MALLORY
  • MEMBER
  • 3 POSTS
Thanks. I got a blower motor resistor and looks the same. I hope this fixes it.
Aug 7, 2020 at 11:36 PM
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STEVE W.
  • ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
Depends on the parts store naming, but it really isn't a resistor. These work using pulse width modulation to control the blower speed. I prefer the older method myself, easier to troubleshoot and repair.
Aug 8, 2020 at 3:32 AM
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