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I thought my '01 Santa was the only one with this problem. It depends on the position of the button for using fresh outside air or recirculating the inside air. I can think of two possibilities: Either the cover for the cabin air filter has popped loose, or the damper that chooses outside or return air doesn't move far enough to seal the return air opening under the dash and cold outside air blows out past it. This spring I have several projects planned for the car, and this is one of them. I'll pass along what I find.
Does anybody know what the damper looks like? Where is it? Is it operated by a vacuum or an electric motor? Could the problem be caused by a damper linkage problem, or could it simply be a buildup of dirt that keeps it from moving through a full stroke?
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