A4 Mk3
| Diagram of coolant hose connections |
| Vehicles without auxiliary heater |
Note| Arrows show direction of coolant flow. |
| 1 - | Radiator |
| q | If renewed, refill system with fresh coolant |
| 2 - | Coolant pump |
| 3 - | Coolant temperature sender -G62- |
| 4 - | Thermostat |
| 5 - | Coolant circulation pump -V50- |
| q | Activated by circulation pump relay -J160- |
| q | Removing and installing → Rep. Gr.87 |
| 6 - | Cylinder head and cylinder block |
| q | If renewed, refill system with fresh coolant |
| 7 - | Coolant shut-off valve |
| q | Activated via Climatronic coolant shut-off valve -N422- |
| q | Climatronic coolant shut-off valve -N422- is activated via Climatronic control unit -J255- |
| q | Removing and installing → Rep. Gr.87 |
| 8 - | Bleed hole |
| 9 - | Heat exchanger for heater |
| q | Removing and installing → Rep. Gr.87 |
| q | If renewed, refill system with fresh coolant |
| 10 - | Filler cap for expansion tank |
| q | Checking pressure relief valve → Anchor |
| 11 - | Coolant expansion tank |
| 12 - | Oil cooler |
| q | If renewed, refill system with fresh coolant |
| 13 - | Continued coolant circulation pump -V51- |
| q | For vehicles equipped for a hot climate |
| 14 - | Non-return valve |
| 15 - | Non-return valve |
| Vehicles with auxiliary heater |
Note| Arrows show direction of coolant flow. |
| 1 - | Radiator |
| q | If renewed, refill system with fresh coolant |
| 2 - | Coolant pump |
| 3 - | Coolant temperature sender -G62- |
| 4 - | Thermostat |
| 5 - | Auxiliary heater |
| q | With circulation pump -V55- |
| q | Removing and installing → Rep. Gr.82 |
| 6 - | Cylinder head and cylinder block |
| q | If renewed, refill system with fresh coolant |
| 7 - | Climatronic coolant shut-off valve -N422- |
| q | Removing and installing → Rep. Gr.87 |
| q | Activated via Climatronic control unit -J255- |
| 8 - | Bleed hole |
| 9 - | Heat exchanger for heater |
| q | Removing and installing → Rep. Gr.87 |
| q | If renewed, refill system with fresh coolant |
| 10 - | Filler cap for expansion tank |
| q | Checking pressure relief valve → Anchor |
| 11 - | Coolant expansion tank |
| 12 - | Oil cooler |
| q | If renewed, refill system with fresh coolant |
| 13 - | Continued coolant circulation pump -V51- |
| q | For vehicles equipped for a hot climate |
| 14 - | Non-return valve |
| 15 - | Non-return valve |