Hi, sorry, only just seen this, am going to have garage have a look at it in next week or so, will revert once they know, and give you a shout!I had a similar problem but without the bang. The climate control bar scrolled up and then down to zero. I got a new fan fitted - needless to say the old one started working on the way up to have the new one fitted.
I've still got the old one if you want it, just the cost of sending it. Obviously no guarantee it'll continue working.