Hi Everyone, I am a new member. I have a VX Berlina that has a problem with the aircon unit. I have narrowed it down to a vacuum issue but need some further guidance. The problem is that when the unit is on (it has the single zone climate control unit) when accelerating the unit directs the air flow from the face vents up to the windscreen and when the car is at constant speed the unit redirects the air back down to the face.

Ive pulled everything apart to check for leaks at the engine bay, and under the dash and have found nothing any thoughts??

Thanks
Enayat