The weather finally got warm enough here to turn on the AC. Long story short, it doesn't get cold. When I bought the truck used, the AC didn't work either, but they fixed it at the dealer and it was fine all summer. My question is what does it take to fix? I'm thinking last time they just recharged the coolant, but I dont' want to have to do it every year. Any ideas?

Edited to say the truck is an 02 2500.