Got the halford guy to top up the gas in my aircon today but still dont have cold air, I can hear a slight change in revs when the aircon is switched on which I assume is normal. When he checked the valve before filling it was compleatly empty so he topped it up as normal and it stayed at that level when he finished but still no cold air.

Has anyone else here had this problem??? The car is a 2003 e46 318ci

Thanks
Johny