When I drive on long trips my a/c freezes up and stops blowing cold air. Seems like the evaporator is icing up. Took to dealer and could not replicate. I was driving home the other day after about 3.5 hours it did it again. I took it into the closest dealership and they agreed but couldn't verify the problem because they would have to go through a checklist of things before tearing the dash apart to access the evaporator. I was still about 5 hours from getting home and couldn't wait an undetermined amount of time to diagnose . This is so annoying . Anyone else come across this issue? Is there anything I can do to prevent it from icing over?