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2004 Gran Prix. Why would my heat/ac blower motor take anywhere from 5 to 30 minutes to kick on after I turn it on?

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A bad blower motor control processor ! Electronic's !
Blower Motor Control Processor
The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a PWM signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

Posted on Dec 10, 2016

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Defective blower motor or problems in the Automatic climate control.

Posted on Dec 10, 2016

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1 Answer

Ac/heater doesn't turn off on a 2004 Pontiac grand prix


Usually a break down in the Blower Motor "resistor" the resistor is bad, not the blower motor...you may need to unplug the blower motor until you find and install the resistor...your parts store can confirm the right part, and location. Hope this helps.

Feb 23, 2015 | 2004 Pontiac Grand Prix

1 Answer

I have a 2004 grand prix that when i turn the ac on it doesnt always come on. kinda funny but if i smack the dashboard it turns on. any suggestions?


Try kicking the panel under the dash on the pass side, and / or slamming the pass door, if these also work. You need a new blower fan motor. Sounds crazy but, my daughter has one and that's all the same things they did to get it to work before we replaced the fan motor.

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1 Answer

2002 gran prix Head lights come on when blower is on high


Sounds like a bad ground connection to the blower housing. Try to eliminate this by connecting one 'battery jumper cable' from the ENGINE or battery (neg) to the blower motor housing. You may have to get clear of some plastic to reach it. Does this change how things work?

Aug 16, 2009 | 2000 Pontiac Grand Prix

1 Answer

Heater blower motor only works on high on 2002 pontiac gran prix se-instructions on diy replacement i have the part. Heater Fan works occasionally on speed 5 only. When it doesn't work at all the lights...


for the fan blower motor it could be the resistor or the fan control speed control switch is bad.for no lights replace the DRL RELAY for the lights. for the heated seats check the fuses.

Jun 01, 2009 | 2002 Pontiac Grand Prix

1 Answer

2005 Pontiac Gran Prix blower does not work. I check the fuse at HVAC fuse at the end of the dashboard and it is OK. The switch itself activates the AC light on and off when I turn it...


Check the blower motor which is behind the right side of the dash, in the lower right side of the HVAC Assembly, above foot area of the passenger floor. The other thing to test is the blower motor resistor which should be next to the blower motor.

Jan 28, 2009 | 2005 Pontiac Grand Prix

2 Answers

Heater and ac blower


I have an '04 with approx. 79000 miles; the blower is going out on mine too. The motor is probably burned out and you will need to replace it. It's about $90 for the part. Kind of a pain to change; I changed the blower motor on my 97 'prix and I had to lay upside down on the passenger seat and work on it upside down. Other than a little physically uncomforable, not too hard to do.

Nov 22, 2008 | 2004 Pontiac Grand Prix

2 Answers

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I would suggest replacing the blower motor resistor. When this component fails the blower will only work on one spped or none. This is a very common issue with all automotive models

Nov 04, 2008 | 2004 Pontiac Grand Prix

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