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The wax would certainly clog the system if it were just introduced directly into the system. If we did make a thermos with wax it would have to be isolated from the coolant to prevent this.
I have heard of manufacturers looking at integrating phase change materials into heater cores to prolong heating/cooling with start/stop systems so that they can maintain blowing heat or cool longer with the engine off. This is certainly another interesting possibility of using latent heat.
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