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My thoughts:
Divert one of the engine's coolant hoses (inside the loop behind the thermostat) through a copper tube wrapped around the exhaust manifold. Add a heatercore with a fan that's wired in parallel with the radiator's fan to help with cooling once everything is warmed up.
Honda built the G1 Insight with a waterjacket on the exhaust manifold and beefed up the main radiator a bit to compensate.
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