why does my heater only run on high ? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-13-2009, 09:56 PM   #1
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Question why does my heater only run on high ?

Hello I have a 94 bonne. with the **** style heating-cooling system.
The fan motor only runs while turned on to the highest setting the other three don't do anything.
Anyone here had this problem or knows how to fix it ?
Any help would be greatly appreciated. thankyou
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Old 11-13-2009, 11:08 PM   #2
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sounds like the infamous blower motor resistor. It is located in the top of your HVAC box under the maxi fuse bank under your hood. I think 2 7mm bolts hold it in, and it is a swap in/out fix. Any auto parts store should have it.
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Old 11-13-2009, 11:37 PM   #3
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Thanx for the quick response.
I will try and replace the resistor then .
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