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2004 Silverado Climate Control and seat heater problems

I have a 2004 extended cab Silverado. Recently, my climate control would blow hot air, when the AC was all the way down. I would turn off my truck, wait a few minutes, start the truck and it would correct the problem. Now, I have 2 other issues. The air blower will run, even when the truck is not warmed up. In the past, it would start blowing air (on cold days), after the truck would warm up. Additionally, the driver seat heater is not working. I hit the button, lights go on and 2 seconds later it turns off. I repeat this and it just keeps on turning off?

Hoping someone here has a suggestion on what the problem could be. I hate bringing it to a dealer for them to trouble shoot with parts...that gets too expensive.

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