Quote:
Originally Posted by DoomsdayJesus
There are passive vents (rubber flaps) by the tail lights that dump cabin air through the bumper when the windows are up. I'm assuming that's what lets the air out when the windows are up. I think almost all modern cars have them, you can see them when someone's driving around with their rear bumper off.
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Actually this brings up an interesting point... could the location of this vent (behind the bumper & rear wheels) on this car make the HVAC vent more outside air at speed?
My old S13s (all ~9 of them) had this "problem", where the location of the vents + any speed over 15MPH allowed air to be "pulled" out of the cabin via this pressure vent, and to the occupants of the car it feels like air is being pushed in when the fan is off.
-alex
P.S. The pressure vent that you speak of is a design on every modern car, to vent out cabin air when you close the door. Otherwise, the airtight design of modern cars could blow out your windows if the air has no place to go.