10.11.3 Operating principle
With the valve (shutter) closed, the coolant goes its usual way: from the pump through the radiator and thermostat to the engine and back.
As soon as the driver and/or passengers feel uncomfortable driving inside the passenger compartment, which covered with hoarfrost, the driver shall open the valve (shutter). The coolant, which is warmed up to normal working temperature (and it is 85-90 °C) will flow on the increased circle to the heater heat exchanger. There it will give part of its heat to temporary inhabitants of passenger compartment. In order for hot air to get to where it is needed, the fan of the ventilation system blows air from the environment through the heat exchanger of the heater into the passenger compartment through special ducts.
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