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Oh, I know!!! You could take the hot water, run it into the passenger compartment, and run it through a radiator there, using it to heat the passengers!!!
For short trip city driving, you are increasing the thermal inertia, making the engine take longer to warm up (even if you start from a higher point), meaning more time below efficient operating range. And yes, added weight makes a significant reduction in stop and go driving.
And for running a steam engine, you need .................. STEAM!!!!!!!
The coolant is slightly below or just barely above the boiling point, meaning not enough heat to boil water through a heat exchanger.
A much more promising method is to cover the exhaust pipe with thermoelectric cells that directly convert exhaust heat into electricity, possibly eliminating the need for the alternator.
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