A3 Mk2
| Diagram of coolant hose connections |
| 1 - | Radiator |
| q | Removing and installing → Chapter |
| q | If renewed, refill system with fresh coolant |
| 2 - | Continued coolant circulation pump -V51- |
| 3 - | Return hose from turbocharger |
| q | With bypass thermostat in hose |
| 4 - | Map-controlled engine cooling thermostat -F265- |
| q | Removing and installing → Chapter |
| 5 - | Coolant pump |
| q | Removing and installing → Chapter |
| 6 - | Cylinder head/cylinder block |
| q | If renewed, refill system with fresh coolant |
| 7 - | Turbocharger |
| q | Removing and installing, engines with code letters AXX, BPY, BWA → Chapter |
| q | Removing and installing, engines with code letters BHZ, BZC, CDLA, CDLC → Chapter |
| 8 - | Expansion tank |
| q | With filler cap |
| q | Checking pressure relief valve in filler cap → Chapter |
| 9 - | Heat exchanger (for heating system) |
| q | If renewed, refill system with fresh coolant |
| 10 - | Hose |
| q | For automatic gearbox only |
| 11 - | Gear oil cooler |
| q | For automatic gearbox only |
| 12 - | Hose |
| q | For automatic gearbox only |
| q | With bypass thermostat in hose |
| 13 - | Coolant hose/pipe connection |
| 14 - | Engine oil cooler |
| 15 - | Intake manifold |
| q | Removing and installing → Rep. gr.24 |
| 16 - | Hose |
| q | Only fitted in vehicles with auxiliary radiator |
| 17 - | Auxiliary radiator |
| 18 - | Hose |
| q | Only fitted in vehicles with auxiliary radiator |
