Notices for opening and part exchange in refrigerant circuit (M4 2021-2023)

Required Special Tools: 

• 00 9 030
• 32 1 270

Attention! 

• Always use new O-rings each time A/C connections are opened (refer to applicable BMW parts catalogue)

  They must not  be coated.

  Use special tool 00 9 030 to mount sealing rings without damaging them.

• Open the referigerant circuit for as short of a period as possible.
• Close all components and lines in the refrigerant circuit and return parts immediately  following the removals at openings with special tool 32 1 270 to prevent penetration of moisture or foreign objects.
• If the refrigerant circuit has been sealed at openings with special tool 32 1 270 but remains open for longer than 48 hours, the desiccant insert for the air conditioning system must be replaced.

1. Part exchange as preliminary work for further work and part exchange due to creeping leakage  (minor leak, e.g. hairline crack)

   Procedure: 

   • Suction heating and air conditioning system, then determine suctioned coolant oil level
   • Carry out part replacement
   • Replace removed refrigerant oil and additionally top up with new refrigerant oil according to components replaced:
     • Air conditioning compressor: refer to NOTES ON COMPRESSOR EXCHANGE .
     • Evaporator: 10 ml
     • Capacitor: 20 ml
     • Desiccant insert/dryer flask: 20 ml
     • Each replaced refrigerant line: 10 ml
     • Condenser with integrated dryer flask: 40 ml
     • Safety pressure switch and gasket: No additional refrigerant oil
     • Only I01: Radiator, high-voltage battery unit: 20 ml
   • Evacuate and charge conditioning
2. Part replacement due to sudden leakage 

   (major leak, e.g. line disconnection due to accident)

   Procedure: 

   • Suction heating and air conditioning system, then determine suctioned coolant oil level
   • Carry out part replacement
   • Replace removed refrigerant oil and additionally top up with new refrigerant oil according to components replaced:
     • Air conditioning compressor: refer to NOTES ON COMPRESSOR EXCHANGE .
     • Evaporator: 35 ml
     • Capacitor: 35 ml
     • Desiccant insert/dryer flask: 55 ml
     • Each replaced refrigerant line: 35 ml
     • Condenser with integrated dryer flask: 55 ml
     • Safety pressure switch and gasket: No additional refrigerant oil
     • Only I01: Radiator, high-voltage battery unit: 35 ml
   • Evacuate and charge conditioning