AC is electronic dual controll. The driver side works good. The passenger side with the temperature set at 60 degrees it may blow cold or neutral or hot air. When blowing cold air on both sides and raising or lowering the control temperature on either side just 1 degree may cause the passenger side to blow neutral or hot air.
You have dual zones that are controlled by temperature actuators the passenger side has lost its memory or has gone bad you can put it in self programming by disconnecting the battery for ten minutes then hook it back up start the truck turn the temperature control on but do not touch any other controls let it go thru the self programming for about 6 to 7 minutes then select your temperature you want if it still does not work properly you may have a bad actuator or a bad connection at the actuator
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