aircon

Hi all, Wondering if someone may be able to help me? I seem to have trouble with getting any heat from the air conditioning system unless i have driven the car for atleast 20 minutes, only then gradually heat starts to come tbrough the vents. The temp gauge sits at 90 within a few mins of...

My A5 is coming up to 2 years old and is about to go in for its first main service. The dealer is saying that I need to have an air con maintenance service at the same time, at a cost of £70 or £80. Do you guys think it's necessary? The aircon is working fine and there's no smell or anything...