[chevymotocross]

Sounds like it's cycling too much. Also, as you probably know, the A/C system is a self contained system..... nothing should have to be added, unless it leaked out. For you to add two cans of refrigerant since it was last charged, there is obviously a good leak. I would have dye ran through the system to check where the leak is, have it recovered, vacuumed, and recharged with proper amount (I think it's 3 lbs). With a fresh charge and leak repaired, the excessive cycling should stop when AC is on. Speaking of cycling, it should only be cycling on Defrost, or, when the a/c is on it might cycle some because temperature inside the cab is nice and cold, the compressor must now cycle to prevent the evaporator from turning into a block of ice, restricting airflow. You have a charge problem for sure.