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#2: 01-16-2013, 10:45 PM
ehsnils's Avatar
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If you never expect to drive in any humid/cold weather conditions it's likely to be safe to bypass, but otherwise you should keep the heating since there's a risk that the butterfly can stick in an awkward position causing an uncontrollable engine. It's there to prevent ice to form in the throttle body, and many people that has been driving old carburetor cars has experienced trouble with this, but in those case it has usually been a stalled engine.

With a fuel injection system the conditions may be completely different and the engine may not stall but stick to high revs.