Flushing overview

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

Drain and clean the OIL RESERVOIR of the a/c service station.
Suction the AIR CONDITIONING .
Disconnect all battery GROUND LEADS .
Remove the acoustic COVER .
Remove the DME CONTROL UNIT .
Remove the integrated POWER SUPPLY MODULE (PDM).
Remove control unit BRACKET .
Remove the electric A/C COMPRESSOR (EKK).
Visual inspection of the drained REFRIGERANT OIL from the air conditioning compressor.
Carry out a VISUAL INSPECTION of the drained refrigerant oil in the a/c service station oil reservoir.
Remove the UNDERBODY PROTECTION/FRONT THRUST FIELD .
Remove the UNDERBODY PROTECTION of the steering gear and thrust field respectively.
Drain the COOLANT from the low-temperature cooling system
Remove EXPANSION VALVE .
Remove the tank COVER .
Remove EXPANSION VALVE for high-voltage battery unit.

NOTE: TECHNICAL INFORMATION
The refrigerant circuit must be flushed in the following case only:
With a mechanical fault of the air conditioning compressor and the resulting shavings contribution in the refrigerant circuit .
If necessary, the refrigerant circuit can be flushed in the following cases:

If the refrigerant circuit was open for more than 24 h (e.g., after an accident),
If there are doubts about the correct amount of refrigerant oil in the refrigerant circuit,
If the refrigerant circuit is contaminated.

NOTE: TECHNICAL INFORMATION
Flush the refrigerant circuit in the direction of flow.
Observe the operating instructions for the A/C service station.
For an overview of A/C service stations, refer to additional information (does not apply to USA and Japan).
Read and comply with NOTES on compressor replacement.
Follow the repair instructions for opening and replacing parts in refrigerant circuit.

Flushing	Air conditioning compressor	Refrigerant lines Air conditioning compressor	Condenser (with desiccant insert)	Refrigerant lines Condenser	Expansion valve 1	Expansion valve 2 High-voltage battery unit
1	Removed	Connected to A/C service station High pressure line 2 286 730 Low pressure line 2 286 732	Removed	Connected with each other High pressure line 2 412 531 Low pressure line 2 286 732 Hose 2 285 575	Removed, replaced with 2 420 896	Removed, replaced with 2 412 528
2	Removed	Connected to A/C service station High pressure line 2 286 730 Low pressure line 2 286 732	Removed	Connected with each other High pressure line 2 412 531 Low pressure line 2 286732 Hose 2 285 575	Removed, replaced with 2 412 530	Installed (new part)