Ok, so for the last week I've been driving with a/c on, I have done about 50 miles. The air is cool and dry, no bad smell or anything like that. One thing I have noticed is terrible whining that is revs-dependant. Speed is irrelevant, but when i rev the car, whether it's in the car park or during the trip, on the move, the whining gets louder and the pitch of the sound goes up with the revs. The problem dissapears when I switch the a/c off. Not sure if its normal, but at idle rpm with a/c on I get the sound just like the one you hear when the radiator fan is on. My worry is it's the a/c compressor on its way out. Anyone had similar problems?