1993 Nissan Altima Q&A

1993 Nissan Altima Question: Hot air does not come out

Why when i turn on the hot air to defrost the windshield the air does not come out from that vent but it keeps coming out from other vents , the heat works but does not defrost the windshield please send answer to haideecalderon@hotmail..com -
Answer 1
This is caused by a vacuum leak in a detached or damaged vacuum hose under the dash or hood. -
Answer 2
When you select to blow air on the windshield by selecting the specific windshield vent, it will blow cold air automatically, unless the A/C is turned off! This is because, during cold/rainy weather conditions, the cold (dry A/C cooled) air dries the windshield more effectively than by blowing hot air. -