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I have a 2000 Grand Prix with the same problem. I found this response on another website:

"The problem is the blower motor resistor. This is a very common problem. It is located under the passenger side of the dash in front of the blower motor. The replacement part should be an updated and improved design."

Now I just have to figure out how hard to get at this is gonna be.

Good Luck.

I had the exact problem w/ one of my own. It is the resistor board. It is common on GM vehicles newer. They redeigned this particular part due to failure history. It is simple to change;also. It is located on the righthand side of the vehicle inside the cabin. Look down in the corner near the firewall and you will see a cvr that needs to be removed. After removing that cvr you will see a harness with a plug on it. That's it. Remove the two screws and wala the resistor bank appears. Reverse these steps to complete. HAVE A GOOD TIME!!!

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βˆ™ 2015-07-16 18:20:49
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Q: How to you fix a HVAC blower that only functions in switch positions 3 4 and 5 on a 2000 Grand Am?
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