I have taken it for service, (when it was not blowing cold) the coolant was slightly low. The typical scenario is when it's been turned off for a while, then restarted, the a/c blows cold again. In the past months it would go several days to a week or more and work fine, now it starts blowing warm, but not right away, just about every time we go anywhere.
Sometimes just before it starts blowing warm I hear a strange sound from under the dash. Hard to describe but I think it is the sound of an air controlled damper or butterfly. This sound does not always occur, but when it does it always starts blowing warm. Once it starts blowing warm it does so for the rest of the trip.
I'm trying to give as much info as possible....and suggestions?