Schematic diagram of cooling system 1 Raw water inlet 2 Raw water pump 3 Turbocharger, liquid-cooled 4 Bleeder screw on turbocharger (only for initial filling of coolant or refilling) 5 Exhaust manifold, liquid-cooled 6 Intercooler 7 Coolant temperature measuring point 8 Engine expansion tank bleeder pipe with construction 9 Expansion tank 10 Positive pressure / negative pressure valve 11 Coolant filler neck 12 Heat exchanger, engine coolant / raw-water 13 Thermostat (open) 14 Water pump housing with integrated thermostat housing 15 Raw water outlet 16 Heater feed and return system 17 Crankcase 18 Engine oil cooler 19 Gearbox oil cooler 23