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2004 Pontiac Grand Prix Interior Blower Fan

Tiny
PHILIPT631
  • MEMBER
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 109,000 MILES
All of a sudden the interior blower fan won't shut off when I shut off the engine. It also always runs on high speed. The interior fan control does not work.

I tried removing one of the fan relays in the fuse box and also a couple of fuses. The only fuse that will shut off the fan is the 30amp titles Battery Main.

Any ideas?
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Thursday, June 18th, 2009 AT 4:16 PM

1 Reply

Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
Some customers may comment on an inoperative or intermittent Heating, Ventilation and Air Conditioning (HVAC) blower motor. Others may comment that the blower motor speed may momentarily drop or that the blower motor continues to run after the key is turned off.This condition may be caused by a voltage spike from the wiper motor. The voltage spike may cause a logic lock up in the blower motor control module that may be either momentary or permanent.Install a Capacitor at the Blower Motor Control Module Connector.


https://www.2carpros.com/forum/automotive_pictures/147643_capa_1.gif

post back with any other questions
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Thursday, June 18th, 2009 AT 7:46 PM

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