Venting the low-temperature cooling system
Preliminary work
NOTE:
TECHNICAL INFORMATION
Immobilization period-long fill of coolant!
Do not reuse used coolant
When replacing and removing components which rely on the corrosion protection effect of the coolant, it is essential to change the coolant. The cooling system must therefore be emptied and refilled
In the case of other removal work involving the draining of part quantities of coolant, the coolant level must be topped up with new coolant
Immobilization period-long fill of coolant!
Do not reuse used coolant
When replacing and removing components which rely on the corrosion protection effect of the coolant, it is essential to change the coolant. The cooling system must therefore be emptied and refilled
In the case of other removal work involving the draining of part quantities of coolant, the coolant level must be topped up with new coolant
NOTE:
TECHNICAL INFORMATION
Filling without the vacuum filling equipment (watering can filling) is not permitted
If this is not observed, there is a risk of component damage or engine damage
The filling specification must be observed
It is essential to visually check the vacuum filling equipment before use to check that it is functioning correctly and clean
It is not permissible to operate the vehicle if the filling procedure has not been fully completed. Otherwise there may be functional limitations (degradation) or overheating
A bleeding procedure is required after a part has been exchanged in the cooling system and/or after refilling the cooling system
Filling without the vacuum filling equipment (watering can filling) is not permitted
If this is not observed, there is a risk of component damage or engine damage
The filling specification must be observed
It is essential to visually check the vacuum filling equipment before use to check that it is functioning correctly and clean
It is not permissible to operate the vehicle if the filling procedure has not been fully completed. Otherwise there may be functional limitations (degradation) or overheating
A bleeding procedure is required after a part has been exchanged in the cooling system and/or after refilling the cooling system
NOTE:
TECHNICAL INFORMATION
Before starting the automatic cooling system bleeding procedure, make sure that all coolant circuits are filled If the cooling system bleeding procedure is started while one of the coolant circuits is empty, there is a risk of damage to the electric coolant pump when running it dry
Make sure that terminal 15 is not disconnected for the bleeding procedure Switch on low-beam headlights and hazard warning lights. If the low-beam headlights and hazard warning lights are not switched on, the ignition (terminal 15) will switch off automatically after a certain period of time and interrupt the bleeding procedure
Before starting the automatic cooling system bleeding procedure, make sure that all coolant circuits are filled If the cooling system bleeding procedure is started while one of the coolant circuits is empty, there is a risk of damage to the electric coolant pump when running it dry
Make sure that terminal 15 is not disconnected for the bleeding procedure Switch on low-beam headlights and hazard warning lights. If the low-beam headlights and hazard warning lights are not switched on, the ignition (terminal 15) will switch off automatically after a certain period of time and interrupt the bleeding procedure
NOTE:
TECHNICAL INFORMATION
The driving dynamics control must not be set to the ECO PRO switch position
The driving dynamics control must not be set to the ECO PRO switch position
- Adjust the coolant level in the low-temperature coolant expansion tank (1) to the lower edge (2) of the coolant filler neck of the low-temperature coolant expansion tank (1)
- Close the sealing cap on the coolant expansion tank of the low-temperature coolant circuit
- Ensure that the hood is open. Connect battery charger
- Activate
testing-analysis-diagnosis (PAD) by quickly pressing the START-STOP button three times
- Activate the low beams and the hazard-warning lights at the same time
If the low beams and the hazard-warning lights are not turned on, the ignition (terminal 15) turns off automatically after a while and interrupts the bleeding procedure
- Ensure that Driving Dynamics Control is not in the "ECO PRO" switch position
- Set the heating to the maximum temperature and the blower to the lowest level
- Press the accelerator pedal up to the stop for at least 10 s and do not press the brake pedal while doing this
- Do not start the engine
The cooling system bleeding procedure starts
The electric coolant pump is activated in the low-temperature coolant circuit according to a cooling system bleeding procedure for 11 min
The cooling system bleeding procedure is ended after 11 min
The electric coolant pump is not activated any longer
- Note the display on the instrument cluster (KOMBI)
If the service function is canceled, the cooling system bleeding procedure must be repeated
- Let the coolant temperature cool down to < 50°C
- Loosen sealing cap (1)
NOTE:
TECHNICAL INFORMATION
After the cooling system bleeding procedure, the cooling system is topped up via the maximum mark
Overfilling the cooling system serves to balance the remaining air in the cooling system
The normal fill level of the coolant is reached during driving
After the cooling system bleeding procedure, the cooling system is topped up via the maximum mark
Overfilling the cooling system serves to balance the remaining air in the cooling system
The normal fill level of the coolant is reached during driving
- Adjust the fill level in coolant expansion tank (2) of the low-temperature coolant circuit to the maximum mark (1)
- Close sealing cap (1)
Follow-up work