Question about 2004 Pontiac Bonneville

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Blower fan doesn't work on AC, ''room temp'' or heater

I have a 2004 Bonneville SE. The cabin fan(s) worked great for 2 yrs, then started working irradically. Now, the blower fan doesn't work at all. If I turn the temp to heat and crack the window a little, warm air will circulate -- but the fan isn't moving ANY air. If I turn the AC on, select defrost and crack the window a little, cold air will circulate through the windshield vents. Otherwise, NO air moves in the car at all -- the fan doesn't come on at all. I have checked the four related fuses under the back seat. All appear to be good.

What else can I do? I'm not a mechanic, but I can do small repairs on my own -- *if* I know what needs to be replaced. THANKS!

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  • Charlie Jarman
    Charlie Jarman Nov 24, 2008

    SOLUTION: I can't "legally" write a solution for my own problem, but...

    I took the car to a local mechanic. He tested the blower motor, etc.
    The problem turned out to be a defective blower motor resistor. I
    should have the car back this afternoon -- fixed and ready to go.

    Anyone who reads this question can consider it closed. I'm leaving it here, so others can hopefully find the fix and help themselves.


  • Charlie Jarman
    Charlie Jarman Nov 26, 2008

    COMMENT: The mechanic called back. The problem wasn't the blower motor
    resistor after all. It was the blower motor itself. A new one costs
    $130-$160, so I decided to do a little checking for myself last night.



    Thank the LORD, I found the problem. The wires connecting the motor
    brushes
    had frayed/worn out. I took a bit of copper wire and soldered
    it to the broken ends -- reattaching them together.
    Reassembled the motor and put it back in the
    car.
    Works like a charm. Cost = $0 (Truly a blessing)




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SOURCE: 2005 Pontiac Gran Prix blower

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SOURCE: 2005 Grand Prix heater works fine when blower is

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