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Have you checked the refrigerant levels in the system first to make sure they are not low causing issues? The hotter it gets, the more the system will act up if it is low becasue the low pressure (suction) side of the system will get lower causing the pressure switch to cut out the system. This also causes freeze up around the evaporator for the thermostat switches making the vehicle think there is super cold air going through the vents. I would rule that first thing before moving on.
Now if the pressures are good, next is to check for shorts on the pressure switches to see if voltage is going to them and from them. If no voltage to any of them, you will know the issue is in the cab side. If there is voltage going through one of them, then you know there is a pressure or sensor issue. It needs to be narrowed down to know which side to take.
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