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      08-29-2012, 08:24 PM   #2
pixelblue
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Drives: the silver bullet
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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.
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