I had air con fitted to my 99my about 3 weeks ago. I've been using it occasionally to de-mist the screen. It was fine until this week when it's developed a smell. The smell seems a sort of cholrine/plastic smell which is only there when the aircon is on. Any idea's please?

 

It could be a leeking compressor unit - might be an idea to take it back to your dealer to get it checked out more thoroughly....