[48richard]

The original system lets you select either inside or outside air. With mine I have noticed that the air flow is much less when I select inside (recirculated) air, so it doesn't seem any cooler. Now I think about it, though, I never did check to see if that passage from the kick panel vent, which is where the recirculated air goes, is clogged up with leaves or other junk, so it could just be my truck.