A3 Mk1
| Diagram of coolant hose connections |
| 1 - | Radiator |
| q | Removing and installing → Chapter |
| q | If renewed, refill system with fresh coolant |
| 2 - | Oil cooler |
| q | Removing and installing → Item |
| 3 - | Coolant pump/thermostat |
| q | Removing and installing coolant pump → Chapter |
| q | Removing and installing thermostat → Chapter |
| q | Checking thermostat → Chapter |
| 4 - | Cylinder head/cylinder block |
| q | If renewed, refill system with fresh coolant |
| 5 - | Expansion tank |
| q | With filler cap |
| q | Checking pressure relief valve in filler cap → |
| 6 - | Turbocharger |
| 7 - | Intake manifold |
| 8 - | Heat exchanger |
| q | If renewed, refill system with fresh coolant |
| 9 - | Not fitted |
