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As far as I can tell from hanging out here for 7 years, it's just a conventional engine/heater core system with a supplemental electric resistance heater and electric pump for EV only cabin heat. There is no fancy footwork to conserve block heat.
If it's like most systems, there is no liquid valve between the block and the heater core. It's all air control flaps. The engine temperature control (mechanical thermostat) has nothing to do with cabin heat. It opens and closes to keep the engine at operating temperature.
Take LLninja's advice.
If it's like most systems, there is no liquid valve between the block and the heater core. It's all air control flaps. The engine temperature control (mechanical thermostat) has nothing to do with cabin heat. It opens and closes to keep the engine at operating temperature.
Take LLninja's advice.
