Vehicles without auxiliary heater
Note: Blue = large cooling circuit. Red = small cooling circuit. Orange = EGR cooling circuit. Brown = heating circuit.
![](https://www.audimanual.ru/img/q/1836.jpg)
P. I 1. Coolant radiator: after replacement, change the coolant; 2. Ventilation plug; 3. Thermostat; 4. Exhaust gas recirculation radiator pump -V400-; 5. Oil radiator; 6. Cylinder head, row 1 (on right): after replacement, change the coolant; 7. Coolant shut-off valve: vacuum pressure-controlled coolant shut-off valve for Climatronic -N422-; 8. Ventilation hole; 9. Heater heat exchanger: after replacement, change the coolant; 10. Coolant temperature sensor -G62-; 11. Ventilation plug; 12. Radiator of the exhaust gas recirculation system: after replacement, change the coolant; 13. EGR switching valve; 14. Extended cover tank; 15. Expansion tank; 16. Cylinder head, row 2 (left): after replacement, change the coolant; 17. Thermostat for the exhaust gas recirculation system: with the actuator motor for the exhaust gas recirculation system; 18. Coolant pump; 19/20. Check valve: arrow shows direction of flow; 21. Additional radiator: option for the national market; after replacement, change the coolant
Vehicles with auxiliary heater
![](https://www.audimanual.ru/img/q/1837.jpg)
P. II 1. Coolant radiator: after replacement, change the coolant; 2. Ventilation plug; 3. Thermostat; 4. Exhaust gas recirculation radiator pump -V400-; 5. Autonomous heater; 6. Oil radiator; 7. Cylinder head, row 1 (on right): after replacement, change the coolant; 8. Check valve: the arrow shows the direction of flow; 9. Heater coolant shut-off valve -N279-; 10. Ventilation hole; 11. Heater heat exchanger: after replacement, change the coolant; 12. Coolant temperature sensor -G62-; 13. Ventilation plug; 14. Exhaust gas recirculation system radiator: after replacement, change the coolant; 15. EGR switching valve; 16. Extended cover tank; 17. Expansion tank; 18. Cylinder head, row 2 (left): after replacement, change the coolant; 19. Thermostat for the exhaust gas recirculation system: with the actuator motor for the exhaust gas recirculation system; 20. Coolant pump; 21/22. Check valve: arrow shows direction of flow; 23. Additional radiator: option for the national market; after replacement, change the coolant
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