Cheers for the replys
Nope never done anything with the bose system, might take it out and have a look.
I am not expecting it to come out arctic cold straight away but up until a few weeks ago I coud turn my car on and I would at least be getting air coming out of the vents, now most of the time I have nothing. If I just start it up and drive off then it could be up to half an hour later when the system suddenly kicks in and I have air coming out of the vents