[ar5boosted]

Cable tie one to the front of the radiator for testing.

See how much power you get.

An automotive alternator can generate up to 200A for aircon, headlights and all such things.

I personally think that a generator built into the muffler would be better. Because any normal muffler blocks flow and so would a generator. There'd be expired patents to look up from people that have got it working.

Hugely fuel efficient motors have little if any extra heat. That is, the engines don't really get hot enough.

Since I have a Peltier right on my desk now, I worry about the quality of the insulation on the joining wires in an automotive application. But please go ahead and try.