Attention! Risk of burns from hot steam or hot coolant. When the engine is hot, the fluid in the cooling system is under pressure. To relieve pressure, cover the expansion tank cap with a rag and carefully unscrew, gradually relieving pressure.
Note: Blue = small coolant circuit. Green = large coolant circuit. Red = coolant circuit for charge air cooling. Gray = auxiliary heater coolant circuit (only on vehicles with auxiliary heater). The arrows point in the direction of the coolant flow.
1. Coolant expansion tank
2. Cap: coolant reservoir
3. Cylinder head / cylinder block: after replacement, change the coolant
4. Turbocharger
5.Integrated exhaust manifold
6. Heat exchanger of the heating system: after replacement, change the coolant
7. Coolant temperature sender -G62-
8. Coolant pump: with thermostat housing
9. Engine oil cooler
10. Coolant temperature sender at radiator outlet -G83-
11. Radiator of the cooling system: after replacement, change the coolant
12. Coolant bleed pump after engine shutdown -V51-
13. Radiator of the boost circuit: after replacement, change the coolant
14. Intercooler in the intake manifold: after replacement, change the coolant
15. Auxiliary heater: only for vehicles with auxiliary heater