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What are the air intake slots under the windshield and near the windshield wipers for in a car?

Sometimes when we drive past the country side the smell of the farm animals gets inside the car, and i started to wonder how the smell got in the car in the first place. Is that the job of those slots (ive been told theyre air intake slots) under the windshield? To directly take in the outside air and smells and bring them inside the car?

Public Comments

1. Yes those little slots are air intake for you climate control.You should have a position on newer cars that recirculates the air inside the car if the outside air gets objectionable. Care should be taken to be sure that no buildup of vegetation - like leaves or grass- builds up inside the area because as it gets old and wet it will have a tendency to become aromatic and need to be cleaned out. On older cars the covers on top of the vents were removable for maintenance.
2. These are the intake slots for your heating and A/C. You cannot close these off. They are required by law to ensure adequate ventilation of the vehicles interior. It helps minimize any buildup of CO. ;-)=
3. The vent is call a cowl vent and it vents the under side of the hood and engine compartment to remove excess heat. The smell your getting is comming from your your fresh air vent on your heater control unit