Bought a used 105,000 mile Ram 3500 Cummins. Seller gave me all the service records/etc. A/C was 'fixed' to the tune of $1409.00. Invoice showed new evaporator and a line. The work was done at a Dodge dealer in January. I bought the truck in Feb. 2days later,,NO A/C. NO help from the dealer after the seller said he would contact them. Took truck to independent shop and they said no Freon in system, all leaked out. Vacuumed/charged system w/dye. 5 days later, no A/C. Took back and they put the light to the underhood area,,no leaks found. Must be in the dash,,took dash apart and no dye/leaks found. The evaporator was not a new one. I did have them put a new heater coil in while they were there, so it was not all labor time lost. Vacuumed/charged again,,no air 5 days later. Anybody got any ideas?? I would think that big of leak would be easily found. Condensor has been inspected,,the dealer did put a new accumulator/drier on it and charged for an evaporator.