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Sorry to here you are having problems with Sam Galloway Ford in Fort Myers. But the problem is caused by a broken or failed temperature blend door actuator/door for the rear AC system. It is vacuum operated but we have also see the doors break and cause either full cold AC or full heat. You will have to remove the last two rows of seats and then pull the drivers side rear upper and lower trim panels to access the rear evaporator case to get to the temperature blend door and actuator.