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I allways thought warm air into a carb was to combat carb icing,when warm air is selected on a light aircraft the idle rpm drops by 100 or so.I would have thought if you lived in a dry warm area warm air would not be needed. I experimented on a 1988 ford
and fitted manual cold/warm air selected by a switch in the car.The situation may be different on a more modern car where it may be designed to compensate for differing air temps.
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