Hello. This seems wery interesting idea. As a eco solution one could use beeswax.
Wax expands as it melts, opposite to the water, so might need bigger expansion tank.
So this system is taking shape. My abstract of the system, as I understand at the moment:
1.Use old 10L already insulated water boiler, may have electric heater also.
2.Add wax to the boiler. Can't just add wax to the coolant, so pack it in some rubber bag, or heat resistant plastic bag, or pipes, and place it inside boiler. Some water siphones have suitable rubber bags.
3.Connect it to the vehicles cooling system with hoses, and some kind of valve or thermostat.
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