Quote:
Originally Posted by extragoode
Example: If you don't like toxic fumes and smells being transferred to the cabin along with the heat, use another medium as a buffer. Water/antifreeze responds to convection currents just like air does. Put heat exchanger from water mix to exhaust plumb to the coolant to air exchanger in the cabin. Bingo, best of both worlds! Sure it's not terribly efficient and would now be subject to a warm up time again, but you can't tell me that there's not more than enough heat in the exhaust and since the fluid for this purpose would be only for this purpose, it's quantity could be much less, therefore, warm up much faster.
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You would need alot of fluid, otherwise you will scorch the working fluid and it will brake down rather quickly.
the Honda N600 also has an air cooled engine with exhaust heat, a pin hole in the heat exchanger and you start to get light headed while driving if you turn the heat on, on VW's the heat exchanger was a costly part that wore out fast, something like a heat pipe could work well.