Checking cooling system for watertightness
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2023 BMW M5, 2022 BMW M5, 2021 BMW M5, 2020 BMW M5, and 2019 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Hot fluids.
Risk of scalding!
Risk of scalding!
- Conduct all work in the vehicle wearing appropriate personal protective equipment only.
WARNING:
Hot surfaces.
Risk of burning!
Risk of burning!
- Perform all work only on components that have cooled down.
CAUTION:
Materials harmful to health.
Contact with fluids harmful to health!
Contact with fluids harmful to health!
- Note and follow safety instructions on containers.
- Conduct all work in appropriate personal protective equipment only.
WARNING:
Hot surfaces.
Risk of burning!
Risk of burning!
- Perform all work only on components that have cooled down.
- Release sealing cap (1) on the coolant expansion tank.
Check
- Mount the special tool 0 494 418 (17 0 101) with the special tools 17 0 102 and 0 494 642 (17 0 113) from the set of special tools 0 494 417 (17 0 100) on the coolant expansion tank .
- Use the special tool 0 494 418 (17 0 101) to establish pressure of 1.5 bar in the cooling system.
Desired state
- A pressure of 1.5 bar is maintained for 2 min.
Result
» Pressure in the cooling system drops.
Measure
- Find and fix leak in cooling system.
Check
NOTE:
TECHNICAL INFORMATION
If the described test step is not completed successfully: repeat test step twice. Only replace the sealing cap after three tests with an incorrect opening pressure.
When driving at high ambient temperatures, the design may cause the pressure relief valve in the sealing cap to open slightly and air to leakage together with dissolved coolant. This coolant vapor condenses on the surface of the coolant expansion tank and leaves traces of coolant when the vehicle has cooled down. These traces of coolant do not indicate whether the sealing cap is defective or not.
Leakage coolant vapors when the vehicle is at standstill may cause the pressure relief valve to stick to the sealing cap. This may cause an incorrect opening pressure.
If the described test step is not completed successfully: repeat test step twice. Only replace the sealing cap after three tests with an incorrect opening pressure.
When driving at high ambient temperatures, the design may cause the pressure relief valve in the sealing cap to open slightly and air to leakage together with dissolved coolant. This coolant vapor condenses on the surface of the coolant expansion tank and leaves traces of coolant when the vehicle has cooled down. These traces of coolant do not indicate whether the sealing cap is defective or not.
Leakage coolant vapors when the vehicle is at standstill may cause the pressure relief valve to stick to the sealing cap. This may cause an incorrect opening pressure.
- Screw on sealing cap on special tool 0 494 643 (17 0 114) from the set of special tools 0 494 417 (17 0 100) .
- Use the special tools 0 494 418 (17 0 101) and 17 0102 from the set of special tools 0 494 417 (17 0 100) to build up pressure, observe the pressure tester as to when the opening pressure is reached.
Desired state
- Opening pressure of the sealing cap is 2 bar.
Result
» Sealing cap opens before or after 2 bar.
Measure
- Replace sealing cap.