A3 Mk2
| Connection diagrams for coolant hoses - engine codes CBAA, CBAB, CBBB |
| Connection diagram for coolant hoses without 4/2-way valve: |
| 1 - | Radiator |
| q | If renewed, refill system with fresh coolant |
| 2 - | Pump for exhaust gas recirculation cooler -V400- |
| 3 - | Engine oil cooler |
| 4 - | Thermostat |
| 5 - | Coolant pump |
| 6 - | Cylinder head and cylinder block |
| q | If renewed, refill system with fresh coolant |
| 7 - | Coolant expansion tank |
| q | With filler cap |
| q | Checking pressure relief valve in filler cap → Anchor |
| 8 - | Exhaust gas recirculation cooler |
| q | If renewed, refill system with fresh coolant |
| 9 - | Auxiliary heater |
| 10 - | Circulation pump -V55- |
| q | Only on vehicles with auxiliary heater |
| 11 - | Heat exchanger for heater |
| q | If renewed, refill system with fresh coolant |
| 12 - | Gear oil cooler |
| q | For dual-clutch gearbox |
| q | If renewed, refill system with fresh coolant |
| Connection diagram for coolant hoses with 4/2-way valve: |
| 1 - | Radiator |
| q | If renewed, refill system with fresh coolant |
| 2 - | Pump for exhaust gas recirculation cooler -V400- |
| 3 - | Engine oil cooler |
| 4 - | 4/2-way valve |
| q | Removing and installing → Chapter |
| 5 - | Coolant pump |
| 6 - | Cylinder head and cylinder block |
| q | If renewed, refill system with fresh coolant |
| 7 - | Coolant expansion tank |
| q | With filler cap |
| q | Checking pressure relief valve in filler cap → Anchor |
| 8 - | Exhaust gas recirculation cooler |
| q | If renewed, refill system with fresh coolant |
| 9 - | Auxiliary heater |
| 10 - | Circulation pump -V55- |
| q | Only on vehicles with auxiliary heater |
| 11 - | Heat exchanger for heater |
| q | If renewed, refill system with fresh coolant |
| 12 - | Gear oil cooler |
| q | For dual-clutch gearbox |
| q | If renewed, refill system with fresh coolant |
