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Ac changes from cold on drivers side hot on its own

Joined
Aug 7, 2015
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Location
FL
I have a 2004 Silverado that the ac on the drivers side will change on its own to heat while going down the road . Passenger still on ac . The only way I can get it to change back to ac is to shut off ignition and restart
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truck then it changes back on its own . Anyone know why or the fix for this problem?
 
I don't know the answer , but my 02 olds was doing that while still in the 3 year warranty , the dealer worked on it all day back then , and fixed it. then while working on it last year , I didn't plug in a vacuum line and the whole ac / hv system went wacky , ac coming out the heat vents on the floor ect. the system used vacuum to switch the vents from floor , defrost , ac ect.
 
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