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Hi, when you pull down the motor you will see 2 or 3 wires coming out of the housing on the blower. That is the resistor, I believe it to be a 4 speed fan although I may be wrong. This is a comon problem they collect moisture and debris over the years and then *poof* they are gone. GM sells the replacement resistor and it is far better than trying to repair it yourself. No offense to all who have tried or done it, I have had little luck in doing so. The part last time I checked was between $85 and $105. You might strike gold at a parts store and get it cheaper. I don't recomend salvage parts on this matter do to the frequent failure of the part. Hope this helps.
 
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