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Scheme of the heater automatic control system: 1 - fan motor; 2 - additional resistance; 3 - control unit; 4 - to the switch for lighting and headlights; 5 - mounting block; 6 - to power sources; 7 - ignition switch; 8 - air temperature sensor in the cabin; 9 - recirculation mode switch; 10 - to the central light switch (side light); 11 - recirculation valve; 12 - damper drive gear motor