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First, start the truck and tur the AC on and see if the AC compressor clutch is engaging please.
Is it cycling on and off while the engine is running every 3 to 5 seconds?
There is a leak in the system. Even though the compressor is engaging, if there is no Freon or very low Freon level in the system, it will not cool down. You will need to have the system properly checked for leaks. We have seen issues with the evaporators leaking in these F250s. Sometimes you will smell the Freon inside the cab when the blower motor is running.
Do you have a manifold gauge set to check pressures when the engine is running?How did you check the charge level?
You will need to check the pressures on the high side and low side of the system. Just checking the Freon level with a fill can is not the proper way. If you have a restriction in the system, it will not cool. And if you have a failing compressor, the system will not cool because the pressures do not reach the proper specifications and the low side cycle switch and the AC cut out switch will shut the compressor off if the pressures are not at the proper levels.