Cooling System

Coolant Hose Connection Diagram

• Connecting the auxiliary heater into the coolant circuit

With Manual Transmission





1 Radiator

2 After-run coolant pump (V51)

3 Coolant pump

4 Coolant thermostat

5 Engine oil cooler

6 cylinder head and cylinder block

7 Turbocharger

8 Coolant reservoir

• With cap

• Pressure relief valve in cap, checking => [ Cooling System, Checking for Leaks ] Testing and Inspection

9 To auxiliary heater

10 From the auxiliary heater

11 Heater core

12 Coolant connection

Vehicles with automatic transmission

• Connecting the auxiliary heater into the coolant circuit





1 Radiator

2 After-run coolant pump (V51)

3 Coolant thermostat

4 Coolant pump

5 Engine oil cooler

6 cylinder head and cylinder block

7 Turbocharger

8 Coolant reservoir

• With cap

• Pressure relief valve in cap, checking => [ Cooling System, Checking for Leaks ] Testing and Inspection

9 To auxiliary heater

10 From the auxiliary heater

11 Heater core

12 Transmission oil cooler

13 Coolant connection

14 Thermostat for the transmission oil cooler

• On some vehicles, the thermostat is located on the outflow side of the transmission oil cooler.