Hi, John: I'll try out the test you suggested on the door vents, tomorrow. I just went out to my 91 GL and with a flashlight peered into the rear window vents from outside the car. The top half of this vent (which runs the full height of the window) has a flexible rubber flap over a rectangular opening that is open to the interior of the vehicle. This opening, as has been stated, is filled with a porous "foam" (filter) material. This "vent" allows air pressure that builds up in the vehicle interior (i.e., from slamming a front door, or from the pressure increase from having air vents open at 60MPH) to escape. I imagine they help eliminate pressure on passenger eardrums as well. As for the A/C issue: all outside forced air vents should be closed when operating A/C. So the pressure in the vehicle would be fairly constant and little "cold air" would be lost out these rear window vents. But that's just a guess, at this point. In any case, these rear vents are way kool lookin' ! - - George Chapman, 91 GL Lake Almanor, CA |
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