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Punta Gorda, FL
To get an a/c system to cool more than 20 degrees is about all that can be expected. Your reading of 68 degrees sounds adequate but the blower fan or vent directions may need to be reset to get the conditioned air circulating in the truck. Remember to open the windows to allow the real hot air out when initially starting to cool the vehicle and use the recirc setting if the air is acceptable - like no smoking etc. needing to be let out; you'll get extra performance from the a/c system.
I believe it is the master power window switch on the drivers door. Mine does the same thing. I got it to work for a short time by giving the door panel a good thump but it lasted a day or two. Replacing the switch is an easy fix and is less than a $100. Easy to replace on you own.
I have the same problem. It works intermittently (never when passengers are in truck). I took the drivers door apart and believe it requires changing the window control switch for all of the power windows. It's less than a $100 for this fix. Easy to do also.