A4 Mk2
| Diagram of coolant hose connections |
| 1 - | Auxiliary radiator (right-side) |
| q | Removing and installing → Chapter |
| q | If renewed, refill system with fresh coolant |
| 2 - | Not fitted |
| 3 - | Thermostat for auxiliary radiator |
| 4 - | Oil cooler |
| q | Removing and installing → Chapter |
| 5 - | Cylinder head/cylinder block |
| q | If renewed, refill system with fresh coolant |
| 6 - | Heat exchanger |
| q | If renewed, refill system with fresh coolant |
| 7 - | Bleed hole |
| q | On coolant hose for heat exchanger |
| 8 - | Filler cap |
| q | Checking pressure relief valve in filler cap → Anchor |
| 9 - | Expansion tank |
| 10 - | Not fitted |
| 11 - | Auxiliary radiator (left-side) |
| q | Removing and installing → Chapter |
| q | If renewed, refill system with fresh coolant |
| 12 - | Non-return valve |
| q | Permits passage in direction of arrow; closed in opposite direction |
| 13 - | Radiator |
| q | Removing and installing → Chapter |
| q | If renewed, refill system with fresh coolant |
| 14 - | Thermostat |
| q | Removing and installing → Chapter |
| q | Checking → Chapter |
| 15 - | Coolant pump |
| q | Removing and installing → Chapter |
| 16 - | Alternator |
