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Home >> Audi >> 2020 >> SQ8 Premium Plus >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Air Conditioning (Refrigerant R1234YF Servicing) (Refrigerant Circuit)) >> 87 Air Conditioning >> Refrigerant Circuit >> Refrigerant Circuit, Cleaning >> Adapter For Assembling Flushing Circuit >> Audi A8 (4H_) from MY 2010

Audi A8 (4H_) from MY 2010

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Vehicle Required Adapters for the Connections to A/C Compressor Adapters Necessary for the Connections to the Reservoir or Receiver/Dryer Miscellaneous
Audi A8 (4H_) from MY 2010 -- Compressor manufacturer "Denso" (block connections with radial sealing)
  • Low pressure side Refrigerant Circuits Adapter Set 1 - Adapter 12:VAS 6338/12  connected with the A/C Service Station and the Refrigerant Circuits Adapter Set - Adapter 48:VAS 6338/48 
  • High pressure side: Refrigerant Circuits Adapter Set 1 - Adapter 3:VAS 6338/3 
 -- No adapter required, desiccant bag is removed from receiver/dryer on the condenser and the opening is sealed again for flushing. The expansion valve is removed and the Refrigerant Circuits Adapter 18:VAS 6338/18  (or the removed expansion valve is drilled for flushing and installed again (refer to PRELIMINARY WORK TO CLEAN REFRIGERANT CIRCUIT (FLUSHING WITH REFRIGERANT R1234YF) )).
  • Additionally on a vehicle with two evaporators (four zone A/C system)
   To flush the circuit with the evaporator in the front A/C unit
  • Refrigerant Circuits Adapter Set 1 - Adapter 5:VAS 6338/5  for sealing the "low pressure side" connection ((to the second evaporator).
  • Refrigerant Circuits Adapter Set 1 - Adapter 11:VAS 6338/11  for sealing the "high pressure side" connection ((to the second evaporator).
  • The adapter may need an additional hole (see below) so that the refrigerant pipes can be covered with the Refrigerant Circuits Adapter Set 1 - Adapter 5:VAS 6338/5  and Refrigerant Circuits Adapter Set 1 - Adapter 11:VAS 6338/11  .
  
    To flush the second evaporator and corresponding lines
  • Refrigerant Circuits Adapter Set 1 - Adapter 3:VAS 6338/3  for connecting the A/C service station to the "low-pressure side" connection (to the second evaporator).
  • Refrigerant Circuits Adapter Set 1 - Adapter 4:VAS 6338/4  for connecting the A/C service station to the "high-pressure side" connection (to the second evaporator).
  • It may be necessary to rework the adapter (see below) so that the refrigerant line can be attached to the Refrigerant Circuits Adapter Set 1 - Adapter 3:VAS 6338/3  .
 The expansion valve in the refrigerant lines to the second evaporator is removed and the Refrigerant Circuits Adapter 18:VAS 6338/18  is installed (or the old removed expansion valve is drilled for flushing and reinstalled (refer to PRELIMINARY WORK TO CLEAN REFRIGERANT CIRCUIT (FLUSHING WITH REFRIGERANT R1234YF) )).
NOTE:

In vehicles with two evaporators, the refrigerant circuit is flushed in two work steps.

Currently the front and rear expansion valves have the same connections (only the control characteristics are different)

Drill an additional hole in the Refrigerant Circuits Adapter Set 1 - Adapter 5:VAS 6338/5  and Refrigerant Circuits Adapter Set 1 - Adapter 11:VAS 6338/11  .

-- Drill a hole -A- in addition to the already existing hole (the dimensions in the illustration are given in mm).

Fig 1: Diagram For Drilling Additional Hole
GWWA87-10722Courtesy of AUDI OF AMERICA, LLC

Rework the Refrigerant Circuits Adapter Set 1 - Adapter 3:VAS 6338/3 

-- Grind off or file off the Refrigerant Circuits Adapter Set 1 - Adapter 3:VAS 6338/3  near -A- without bending the refrigerant line (dimensions in the illustration are in mm).

Fig 2: Identifying Adapter VAS 6338/3 Rework Dimensions
GWWA87-10848Courtesy of AUDI OF AMERICA, LLC
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