Replacing the coolant expansion tank of the high-temperature coolant circuit
WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.
- Loosen screws (1).
- Remove the holder (2).
 Courtesy of BMW OF NORTH AMERICA, INC.
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- Replace coolant expansion tank (1) of the high-temperature coolant circuit.
Parts:
Coolant reservoir
 Courtesy of BMW OF NORTH AMERICA, INC.
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- Install holder (2).
- Tighten the screws (1).
TIGHTENING TORQUE SPECIFICATIONS
| Coolant expansion tank to holder |
| Hexagon screw M6x16 |
Tightening torque |
8 Nm |
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Courtesy of BMW OF NORTH AMERICA, INC.
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