Removing coolant expansion tank of high-temperature coolant circuit

NOTE: DANGER
High-voltage system.
The high-voltage system operates on the basis of hazardous, electrical voltage and high currents. Mortal hazard through electric shock!

All work on the high-voltage system may only be carried out by specially trained and technically experienced personnel.
For additional information see:
61 00... SAFETY INSTRUCTIONS ON HANDLING HYBRID CARS .
For additional information see:
61 25... NOTES ON REPAIR OF HIGH-VOLTAGE BATTERY UNIT .

Preliminary work

Refer to REMOVING THE UNDERBODY PROTECTION OF THE STEERING GEAR AND THRUST FIELD RESPECTIVELY .
Refer to REMOVE THE COVER IN THE ENGINE COMPARTMENT ON TOP .
Refer to REMOVE LEFT FRONT-END STRUT .

WARNING: Hot surfaces.
Risk of burning!

Perform all work only on components that have cooled down.

NOTE: TECHNICAL INFORMATION
Use commercially available pinch-off tools to pinch off the coolant hoses.

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.

NOTE: TECHNICAL INFORMATION
Collect and dispose of emerging fluids. Observe country-specific waste disposal regulations.

Thread in clamping pliers (2) and install.
Unlock and loosen coolant line (1).
Catch and dispose of leakage coolant.

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock and loosen lock (1).
Loosen the coolant expansion tank (2) in the direction of the arrow.
Feed out coolant expansion tank (2) and set it aside.

Courtesy of BMW OF NORTH AMERICA, INC.
Loosen sealing cap (1).
Draw the coolant off with a conventional pump.

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock and loosen coolant line (1).
Catch and dispose of leakage coolant.
Unlock lock (2).
Remove coolant expansion tank (3) from guide (4).
Guide the coolant expansion tank (3) out of the rubber mount (5) and lift.

Courtesy of BMW OF NORTH AMERICA, INC.
Thread in clamping pliers (4) and install,
Unlock and loosen the connector (1) on the coolant level switch.
Unlock and loosen coolant line (2).
Catch and dispose of leakage coolant.
Remove the coolant expansion tank (3) upwards,

Courtesy of BMW OF NORTH AMERICA, INC.

WARNING: Hot surfaces.
Risk of burning!

Perform all work only on components that have cooled down.

NOTE: TECHNICAL INFORMATION
Use commercially available pinch-off tools to pinch off the coolant hoses.

NOTE: TECHNICAL INFORMATION
Collect and dispose of emerging fluids. Observe country-specific waste disposal regulations.

Thread in clamping pliers (2) and install.
Unlock and loosen coolant line (1).
Catch and dispose of leakage coolant.

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock and loosen lock (1).
Loosen the coolant expansion tank (2) in the direction of the arrow.
Feed out coolant expansion tank (2) and set it aside.

Courtesy of BMW OF NORTH AMERICA, INC.
Loosen sealing cap (1).
Draw the coolant off with a conventional pump.

Courtesy of BMW OF NORTH AMERICA, INC.
Unlock and loosen coolant line (1).
Catch and dispose of leakage coolant.
Unlock lock (2).
Remove coolant expansion tank (3) from guide (4).
Guide the coolant expansion tank (3) out of the rubber mount (5) and lift.

Courtesy of BMW OF NORTH AMERICA, INC.
Thread in clamping pliers (4) and install.
Unlock and loosen the connector (1) on the coolant level switch.
Unlock and loosen coolant line (2).
Catch and dispose of leakage coolant,
Remove the coolant expansion tank (3) upwards,

Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work

Refer to INSTALL THE LEFT FRONT-END STRUT .
Refer to INSTALL THE COVER IN THE ENGINE COMPARTMENT ON TOP .
Refer to INSTALLING THE UNDERBODY PROTECTION OF THE STEERING GEAR OR THE FRONT THRUST FIELD .