Drain the coolant from the low-temperature cooling system

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: SAFETY INSTRUCTIONS ON HANDLING HYBRID CARS .
• For additional information see: NOTES ON REPAIR OF HIGH-VOLTAGE BATTERY UNIT .

Preliminary work 

• Remove the front UNDERBODY PROTECTION .
• Remove the center UNDERBODY PROTECTION .
• Remove RESONATOR .

• Open the lid (1) on the coolant expansion tank of the low-temperature coolant circuit.

  Courtesy of BMW OF NORTH AMERICA, INC.

• Unlock and pull off the coolant line (1) next to the intake filter housing.
• Catch and dispose of leakage coolant.

  Courtesy of BMW OF NORTH AMERICA, INC.