Q: AC acting up in my truck

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I have a 2006 Chevrolet Silverado with about 85,000 miles on it. The blower for the heater and AC started acting up recently. First it stopped going all the way to the highest setting, and now there are times where it doesn’t work at all. When it does work, it sometimes stays on when the engine is shut off. What’s going on? I need to fix this problem before winter.

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