Quote:
Originally Posted by Ben_G
I haven't had a car that has been able to bring in outside air without getting warmed by the engine in years...I think the last car that could do that was a 96 Camry.... that car had some good HVAC...you could get a good breeze with the fan off just driving at highway speeds.... I miss that car...
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I'm pretty sure manufacturers do this to keep the humidity down in the cabin. Since almost every car comes with A/C these days they figure people won't leave the vents open on a hot day as they should be using A/C anyway.
You'll notice that with the vents set to defrost your AC pump will kick on and off occasionally. It's all part of the same system.