G'day all, thee other day on a cold start my ac was not blowing threw the dash, it was blowing threw the top vents and side window vents . I also noticed my seat fan was blowing colder than usual,strange. The following day cold start ,again it did the same,but this time I started the defrost for a min,when I started the a/c worked fine....is this a sign for future problems ? Any one had this issue before ? 06 750li