My 2001 X5 A/C air flow deminishes through vents after driving car at higher speeds--like freeway. In fact the air is much less thru all vents..switching from front vents to front defrost...etc..

Lettign the car sit, and coming back it an hour or so later, the air flow is MUCH stronger thru vents..cool, etc.---but city driving. It seems like the A/C & vents are definitely effected by the car workign harder..at higher speeds. Could it be the condensor freezing? I get a considerable amoutn of puddled liquid (water condensation) under the car.

Teh Final stage, freon, and microfilter all have been serviced.

Help?