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Message: <blockquote data-quote="AuroraGirl" data-source="post: 26983" data-attributes="member: 9417">I too have a nonfunctional number 4. to my underdstanding this is because of the blower motor and motor resistor or its the most used fan position and it just wears out.  Mine was replaced according to gm VIS , by rhe Dealer in 2005 for the same condition, it was actually a free fix from GM for these vehciles if you had the issue even after the warranty period until like 2009</blockquote>