Vent the high-temperature coolant system
WARNING:
Hot surfaces
Risk of burning!
Risk of burning!
- Perform all work only on components that have cooled down
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 electrical fan is activated during the entire cooling system bleeding procedure
The electrical fan is activated during the entire cooling system bleeding procedure
- Remove the vacuum filling equipment from the coolant expansion tank of the high-temperature coolant system
- Open the bleeder screw on the coolant expansion tank for the high-temperature coolant circuit and close it again after approx. 10 s
- The bleeder screw can be closed before 10 s have elapsed if coolant escapes
- Adjust the fill level in the coolant expansion tank of the high-temperature coolant circuit to the maximum mark
- Close the sealing cap on the coolant expansion tank of the high-temperature cooling circuit
- Ensure that the hood is closed. Connect battery charger
- Activate testing-analysis-diagnosis (PAD) by quickly pressing the START-STOP button three times
- Set heating to maximum temperature
- Set the fan to the lowest level
- Deactivate the testing-analysis-diagnosis (PAD) by pressing the START-STOP button
- Activate testing-analysis-diagnosis (PAD) by quickly pressing the START-STOP button three times
- Depress the accelerator pedal and maintain for 15 s; do not press the brake pedal during this process
The automatic cooling system bleeding procedure is initiated
Depending on the equipment specification of the instrument cluster (KOMBI), ("Service function started") is displayed
- Step off the accelerator pedal and press the brake pedal
- Start engine
The engine speed and actuators in the cooling system are automatically controlled in accordance with a cooling system bleeding procedure
The cooling system bleeding procedure is ended approx. 11 min after the engine start
Observe the display in the instrument cluster (KOMBI). ("Service function ended")
The engine speed drops to the idle speed
If the service function is canceled, the cooling system bleeding procedure must be repeated
- Switch off engine
- 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 the coolant expansion tank (2) of the high-temperature coolant circuit to the maximum mark
(1)
- Close the sealing cap (1) until the arrows align
Follow-up work