There is a slow refrigerant leak in the a/c system that cannot be found.

Truck only has just a little over 70000kms of course no warranty left and will cost over 1200 dollars to repair will not buy another dodge again they have very low quality parts that fail way to early. I had throttle body replaced that was over 600 dollars. I would expect to have much higher miles to have things like this break on the truck.