Advice request 07 Denali heater blower problem

I am very much new to The Forum Community this is my first venture into searching through forums to address some of the issues I have with my truck. I'm certainly not a mechanic but I have the tools and if I know what I'm looking for I can USUALLY fix it myself unless it requires a lift. Again I'm not a mechanic so usually the diagnosis portion is the difficult part for me. Once I know what needs to be replaced or repaired it's just a matter of making the time to get at it and get it done.
 
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