2009 Murano, strange problem, when blower fan is running it functions fine, blows through all vents as it is supposed to, but on the passenger side of the vehicle it is almost as if it leaks and blows the cold air entering the blower fan area into the vehicle from behind the dash/glovebox area onto the passenger's feet making for a very cold ride in 0 degree temps. i know it is the blower fan doing this because as i turn up the fan speed, the air on the feet increases with the fan speed. i'm confused as my wife has owned this vehicle for 3 years and i've never noticed it before. any help would be awesome. Thanks