Cooling System

Coolant Hose Connection Diagrams





1 Coolant pump

• Removing and installing, refer to => [ Coolant Pump ] Coolant Pump

2 Coolant thermostat

• Removing and installing, refer to => [ Coolant Thermostat with Housing ] Coolant Thermostat With Housing

• Checking, refer to => [ Thermostat, Checking ] Testing and Inspection

3 Oil cooler

• Removing and installing, refer to => [ Oil Cooler without Carrier Plate ] Oil Cooler Without Carrier Plate

• Change coolant after replacing

4 Coolant Pump (V50)

5 Heating regulation valve unit

Left Heat Regulating Valve (N175)

Right Heat Regulating Valve (N176)

6 Heater core

• Change coolant after replacing

7 Left side cooler

• Removing and installing, refer to => [ Side Radiator with Coolant Fan ] Side Radiator With Coolant Fan

• Change coolant after replacing

8 Center cooler

• Removing and installing, refer to => [ Center Radiator ] Center Radiator

• Change coolant after replacing

9 Bleeder screw

• In the ventilation hose and on the coolant return line

10 Right side cooler

• Removing and installing, refer to => [ Side Radiator with Coolant Fan ] Side Radiator With Coolant Fan

• Change coolant after replacing

11 Coolant reservoir

• With sealing cap

• The cap must engage noticeably when sealing

• Pressure relief valve in cap, checking => [ Pressure relief valve in cap,
checking ] Cooling System, Checking For Leaks

12 Generator

13 Cylinder head and cylinder block

• Change coolant after replacing

14 Engine Coolant Temperature (ECT) Sensor (G62)

• Removing and installing, refer to => [ Engine Coolant Temperature Sensor ] Service and Repair

Vehicles for countries with warm climates





1 Coolant pump

• Removing and installing, refer to => [ Coolant Pump ] Coolant Pump

2 Coolant thermostat

• Removing and installing, refer to => [ Coolant Thermostat with Housing ] Coolant Thermostat With Housing

• Checking, refer to => [ Thermostat, Checking ] Testing and Inspection

3 Oil cooler

• Removing and installing, refer to => [ Oil Cooler without Carrier Plate ] Oil Cooler Without Carrier Plate

• Change coolant after replacing

4 After-run coolant pump (V51)

• Removing and installing, refer to => [ After-Run Coolant Pump ] Service and Repair

5 Coolant Pump (V50)

6 Heating regulation valve unit

Left heat regulating valve (N175)

Right heat regulating valve (N176)

7 Heater core

• Change coolant after replacing

8 Left side cooler

• Removing and installing, refer to => [ Side Radiator with Coolant Fan ] Side Radiator With Coolant Fan

• Change coolant after replacing

9 Center cooler

• Removing and installing, refer to => [ Center Radiator ] Center Radiator

• Change coolant after replacing

10 Bleeder screw

• in the ventilation hose and on the coolant return line

11 Right side cooler

• Removing and installing, refer to => [ Side Radiator with Coolant Fan ] Side Radiator With Coolant Fan

• change coolant after replacing

12 Coolant reservoir

• With sealing cap

• The cap must engage noticeably when sealing

• Pressure relief valve in cap, checking => [ Pressure relief valve in cap,
checking ] Cooling System, Checking For Leaks

13 Generator

14 cylinder head and cylinder block

• Change coolant after replacing

15 Engine Coolant Temperature (ECT) Sensor (G62)

• Removing and installing, refer to => [ Engine Coolant Temperature Sensor ] Service and Repair