The man on the service truck seemed like a **** good and knowledgeable mechanic/trouble-shooter. He had to work on the a/c 3 times to finally resolve this. Once, he replaced a faulty water valve and once JD sent him the wrong a/c line part to replace. He seemed to really enjoy his job and was always upbeat and in a good mood....even when he wasn't able to arrive until well after 5:00 after working hard all day only to work much later on my tractor. He seemed determined to resolve the problem. I was very impressed with him.