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      08-29-2012, 08:24 PM   #2

pixelblue's Avatar
Drives: the silver bullet
Join Date: Feb 2010
Location: northern virginia

Posts: 2,236
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2010 135i  [4.37]
it's a means of dissipating heat through the heat exchanger. should be worth a few degrees. I've run full heat on a 100+ day. wasn't fun but I had shut the two center vents and directed the two side vents towards the open windows.
"I would quote everything pixelblue said, but you've already read it. Take it from someone who's put the 1 through its paces"