2003 Dodge Ram Truck air conditioner

dodge
trucks
ram
airconditioning

#1

I have Dodge put dye and freon into the system 5 times. They can’t find a leak and no dye shows up. I had the evaporator core replaced and now the freon has leaked out again. It takes 2 to 3 months before the air conditioner quits cooling again. Does anyone have any idea what the problem would be?