My wifes got a mk5 Gt tdi
The car has not had air con since we bought it over a year ago now

Had the car regassed about a month ago and tested for leaks, and all was fine.
Im wondering if anyone has had a similar problem?
Im guessing its probably an electrical fault?
Phoned around to get a vac-com dignostic check but have been quoted around £150-200 and theres no way im paying some one that just to plug a laptop in to the car and press a few buttons

Its got the to point where the car is unbearable to drive, as the "normal" air ventalation system is well pathetic, and as many of you know these modern cars are not designed to be driven with windows open these days, as the noise and buffeting is deafening!!!!
Really need some help here, as its almost got to the point where ive even thought of selling the car!