my '93 750iL's air flow seem a little strange, atleast to me at the moment. In 'auto' setting in cooler temps (16 to 22 degrees) the air flows freely from the front vents in the car (above the radio). but when i turn the temp up (dual climate control) i no longer get air flow from the front vents, the hot air seems to blow out from the front base where the windshield is (as if its defrosting the front) and from the floor vents is this normal, the air is warm so the heater works but i think the air is supposed to change directions like this. If this is not normal what can i do to repair it. Thanks.