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. |
t | Orange = Coolant circuit for exhaust gas recirculation. |
1 - | Not fitted |
2 - | Radiator |
q | If renewed, refill system with fresh coolant |
3 - | Coolant pump |
4 - | Cylinder head/cylinder block |
q | If renewed, refill system with fresh coolant |
5 - | Exhaust gas recirculation cooler |
q | If renewed, refill system with fresh coolant |
6 - | Exhaust gas recirculation temperature sensor -G98- |
7 - | Coolant temperature sender -G62- |
8 - | Coolant circulation pump -V50- |
q | On vehicles with start/stop system only |
9 - | Coolant shut-off valve |
q | Activated by Climatronic coolant shut-off valve -N422- (negative pressure) |
q | Removing and installing → Rep. gr.87 |
10 - | Bleeder hole |
11 - | Heat exchanger for heater |
q | If renewed, refill system with fresh coolant |
12 - | Thermostat |
q | For exhaust gas recirculation cooler |
13 - | Non-return valve |
q | Arrow points in direction of through-flow |
14 - | Sealing cap |
q | For coolant expansion tank |
q | Checking → Chapter |
15 - | Coolant expansion tank |
q | Checking cooling system for leaks → Chapter |
16 - | Engine oil cooler |
q | If renewed, refill system with fresh coolant |
17 - | Pump for exhaust gas recirculation cooler -V400- |
18 - | 4/2-way valve with thermostat |
Vehicles with auxiliary heater |
Note
t | Blue = Large coolant circuit. |
t | Red = Small coolant circuit. |
t | Brown = Heating circuit. |
t | Orange = Coolant circuit for exhaust gas recirculation. |
1 - | Not fitted |
2 - | Radiator |
q | If renewed, refill system with fresh coolant |
3 - | Coolant pump |
4 - | Cylinder head/cylinder block |
q | If renewed, refill system with fresh coolant |
5 - | Exhaust gas recirculation cooler |
q | If renewed, refill system with fresh coolant |
6 - | Exhaust gas recirculation temperature sensor -G98- |
7 - | Coolant temperature sender -G62- |
8 - | Auxiliary heater |
q | On vehicles with start/stop system only |
9 - | Bleeder hole |
10 - | Heat exchanger for heater |
q | If renewed, refill system with fresh coolant |
11 - | Heater coolant shut-off valve -N279- |
q | Diagram of connections, removing and installing → Rep. gr.87 |
12 - | Thermostat |
q | For exhaust gas recirculation cooler |
13 - | Non-return valve |
q | Arrow points in direction of through-flow |
14 - | Sealing cap |
q | For coolant expansion tank |
q | Checking → Chapter |
15 - | Coolant expansion tank |
q | Checking cooling system for leaks → Chapter |
16 - | Engine oil cooler |
q | If renewed, refill system with fresh coolant |
17 - | Pump for exhaust gas recirculation cooler -V400- |
18 - | 4/2-way valve with thermostat |