Hi all I have two problems not sure if they are related. 1. A/C button only lights up if the fan speed is on 1 or 2 if you turn it to 3 the light goes out,do you think getting it refilled will do the trick ? 2. I believe the servo has gone, loud hissing after brake pedal is released, is there a repair kit available or could it be something else. Car running fine otherwise. 2.3 petrol zetec 16v auto 2000 MkII