Quote:
Originally Posted by pasadena_commut
What keeps the exhaust fumes out of the cabin when the fan isn't cranked up? Do you die on the first long drive on a nice day where you don't have the fan on? What happens if the interior windows are just cracked, or the sun roof? Seriously, dropping dead is a poor trade off for possibly saving 0.1 MPG.
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Yeah, I understand; that's why I mentioned the need for positive air pressure. The air coming out the holes is coming out just as hard as it is out of the vents on the dash. I'm in less danger than if I had done nothing and kept the fan off.
Blow on your hand as hard as you can. It's just a little weaker than that, but with more volume because of the size of the holes - each about the size of a half dollar coin.