A5
Diagram of coolant hose connections |
Vehicles without auxiliary heater |
Note
t | Blue = Large coolant circuit. |
t | Red = Small coolant circuit. |
t | Brown = Heating circuit. |
1 - | Radiator |
q | If renewed, refill system with fresh coolant |
2 - | Turbocharger |
3 - | Cylinder head/cylinder block |
q | If renewed, refill system with fresh coolant |
4 - | Coolant shut-off valve |
q | Activated by Climatronic coolant shut-off valve -N422- (negative pressure) |
q | Removing and installing → Rep. gr.87 |
5 - | Bleeder hole |
6 - | Heat exchanger for heater |
q | Removing and installing → Rep. gr.87 |
q | If renewed, refill system with fresh coolant |
7 - | Coolant circulation pump -V50- |
q | Only installed on vehicles with start/stop system |
8 - | Coolant pump |
q | Removing and installing → Chapter |
9 - | Restrictor |
10 - | Filler cap for expansion tank |
q | Checking pressure relief valve → Anchor |
11 - | Coolant expansion tank |
12 - | Non-return valve |
13 - | Continued coolant circulation pump -V51- |
q | Only fitted on vehicles equipped for hot climates |
14 - | Thermostat |
15 - | Coolant temperature sender -G62- |
q | Removing and installing → Chapter |
16 - | Engine oil cooler |
Vehicles with auxiliary heater |
Note
t | Blue = Large coolant circuit. |
t | Red = Small coolant circuit. |
t | Brown = Heating circuit. |
1 - | Radiator |
q | If renewed, refill system with fresh coolant |
2 - | Turbocharger |
3 - | Cylinder head/cylinder block |
q | If renewed, refill system with fresh coolant |
4 - | Auxiliary heater |
5 - | Bleeder hole |
6 - | Heater coolant shut-off valve -N279- |
q | Removing and installing → Rep. gr.87 |
7 - | Heat exchanger for heater |
q | Removing and installing → Rep. gr.87 |
q | If renewed, refill system with fresh coolant |
8 - | Non-return valve |
q | Arrow indicates direction of flow |
9 - | Coolant pump |
q | Removing and installing → Chapter |
10 - | Restrictor |
11 - | Filler cap for expansion tank |
q | Checking pressure relief valve → Anchor |
12 - | Coolant expansion tank |
13 - | Non-return valve |
14 - | Continued coolant circulation pump -V51- |
q | Only fitted on vehicles equipped for hot climates |
15 - | Thermostat |
16 - | Engine oil cooler |
17 - | Coolant temperature sender -G62- |
q | Removing and installing → Chapter |