I've been using my van (1990 Westfalia) in sub 40 F temperatures for
the first time. When I'm at freeway speeds, the heater is blowing
cold air. When I close the floor vents, (3rd lever pushed to the
right) the air gets a little warmer, but not by much. Basically, the
heat coming out is totally inadequate, but only when going fast in
cold weather. In more moderate temps, or when I'm on city streets it
seems OK. So is my front heater broken, or is this how other people's
vans work? I find it hard to believe that people up north could live
with such a pathetic heater.

Thanks,
andy