Coolant level controlled fan or shutters
Most of an engines waste is heat.
How about controlling the coolant fan with a coolant level sensor-actuator.
Basically a float that tells you what the level of coolant is in the recovery bottle and maintains that level with shutters and the normal cooling fan, mostly electric.
Shutters to get it hotter and the fan when it needs to be cooler. Inflatable grille block for air flow regulation, too cold blow them up, too hot deflate them.
Simple cheap and easy.
regards
Mech
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