[Big Dave]

Back in the 1930s, Howard Hughes tried to make a condensing steam car. Needless to say, a 80 HP recip steam engine needs a lot of condensor area, so they tried brazing cooling tube to the backside of all the body panels. It sorta worked - at least as well as a Rankine cycle engine will work.

Somebody bumbled a Model A Ford into it and the driver was scalded by the exhaust steam from the broken tubes.

It was also incredibly expensive, but then it was an engineering prototype and such models are always expensive.