This is a bit of a weird one which has been bothering me for a while. I've got the pre-facelift climate control in my 98 S4 which used to work a treat. I've noticed that over the past few months, it seems to be going a little crazy. When cruising at motorway speeds, you have to turn the temperature up by about 2+ degrees, otherwise it gets quite cold. I thought I was dreaming at first, but on a long journey with occasional traffic jams, it was noticeably warmer when we were going slower or at a standstill. I'm sure it never used to be like this. I suspect one of the cabin temp sensors might be knackered(think I remember reading that there are 2), but don't know how to measure what they are reading. Can't find it on Vagcom anywhere. Anyone else had this?