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I have a number of vehicles where the cabin heat is gotten from exhaust heat exchangers and/or from cylinder waste heat (VW, Corvair, general aviation aircraft (but I don't own one now)). That system can be great WHEN EVERYTHING IS IN PERFECT WORKING ORDER. But, reality interrupts our little daydream (doesn't it always?). Over time exhaust systems rot out and yes, noxious fumes come into the cabin. Also, when (not if) there is an oil or gasoline leak in or near any component of this sort of heating system, all that stench comes in the cabin too.
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