Vent the high-temperature coolant system
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2025 BMW X4, 2024 BMW X4, 2023 BMW X4, 2022 BMW X4, and 2021 BMW X4. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Hot surfaces.
Risk of burning!
Risk of burning!
- Perform all work only on components that have cooled down.
Preliminary work
A= increased idle speed
B=Cooling system bleeding procedure finished
t = Time
NOTE:
TECHNICAL INFORMATION
Filling without the vacuum filling equipment (watering can filling) is not permitted.
Failure to observe these instructions may result in component 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.
Failure to observe these instructions may result in component 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 both coolant circuits are filled. The cooling system bleeding procedure is automatically started simultaneously for both coolant circuits. 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 both coolant circuits are filled. The cooling system bleeding procedure is automatically started simultaneously for both coolant circuits. 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
Immobilization period-long fill of coolant!
Do not reuse used coolant.
The coolant must be replaced when replacing and removing components which depend on the anti-corrosion effect of 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.
The coolant must be replaced when replacing and removing components which depend on the anti-corrosion effect of 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
During the cooling system bleeding procedure, the electric fan may be actuated sporadically.
During the cooling system bleeding procedure, the electric fan may be actuated sporadically.
- 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 the 10 s have expired, if coolant emerges.
- 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.
- Connect battery charger.
- Close driver's seat belt.
- Activate testing-analysis-diagnosis (PAD) by quickly pressing the START-STOPPING button three times.
- Set the heating to the maximum and the blower to the lowest setting.
- Depress the accelerator pedal and hold for 15 s.
The automatic cooling system bleeding procedure is initiated.
- Start engine.
The idle speed is automatically increased to 1200 RPM.
- Actuate the accelerator pedal to approx. 3500 RPM, hold the engine speed for 10 s.
- Maintain idle speed for 30 s.
- Actuate the accelerator pedal to approx. 3500 RPM, hold the engine speed for 10 s.
- Maintain idle speed for 30 s.
- Actuate the accelerator pedal to approx. 3500 RPM, hold the engine speed for 10 s.
- Maintain idle speed for 30 s.
- Actuate the accelerator pedal to approx. 3500 RPM, hold the engine speed for 10 s.
- Maintain idle speed for 30 s.
- Actuate the accelerator pedal to approx. 3500 RPM, hold the engine speed for 10 s.
The cooling system bleeding procedure is ended about 11 min after the engine start.
The engine speed drops to the idle speed again.
- Switch off engine.
- Allow the engine to cool down.
- Adjust the fill level in the coolant expansion tank of the high-temperature coolant circuit to 200 ml above the maximum mark.
- Close the sealing cap (1) until the arrows align.
Follow-up work