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2005 GMC Sierra 2500 HD Question: AC not working on drivers side, only hot temp, dual controls set at 60 degrees.

 

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Visitor, 6.6L V8 Diesel Turbo, Colorado Springs, CO, October 04, 2010, 17:40

Both driver and passenger dual controls are set at 60 degrees with AC on. Driver side will only blow hot heated air. Passenger side will blow cold. Fuses look OK. Any ideas on what the problem could be.

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