air conditioning on 2006 Chevrolet Silverado 1500

Why would hot air be coming from the driver side vents and cold air be coming from the passenger side vents?

If both sides of your climate control are set to equal temps then there is an air direction door malfunction.

http://repairpal.com/directory?address=77429&car_brand_names=Chevrolet
I had the same problem with the AC running hot on one side. Took it to the dealership which replace some sort of relay switch for just about $280. Drove about 15 miles and it happened again. Called the dealership and they said it would cost another $280 (or so) to replace the other side. The solution that has worked for me without paying the additional cost... Turn off the engine and restart the truck -- the relay catches and cold air blows on each side. Pain but works. I haven't had the problem in about 4 months since then.
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