Climate control

[CliveH]

Now that the Summer is allegedly arriving, I'm sure some of you have been having a blast on the aircon recently.

I bought my S4 B5 last October, so this is the first real chance I've had to put it through its paces, but it really doesnt seem to do its job when its getting hot (by that I mean 20C!).

When I put it on "Low" I get a lot of noisy air, but I would hardly call it cool. Is this "normal" for the Audi system or this model (the basic aircon unit in my Mini Cooper S is much more effective), or does it sound like it needs regassing?