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Audi A8 (4N)

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Vehicle Required adapters for the connections to A/C compressor Required adapters for connections to receiver/dryer / to second evaporator Miscellaneous
Audi A8 (4N) from MY 2018
  • Vehicle with one evaporator
 -- Compressor manufacturer "Denso" (block connections with radial sealing)
  • Low pressure side Refrigerant Circuits Adapter Set 1 - Adapter 12:VAS6338/12  connected with the A/C Service Station and the Refrigerant Circuits Adapter Set - Adapter 48:VAS6338/48 
  • High pressure side: Refrigerant Circuits Adapter Set 1 - Adapter 3:VAS6338/3 
 -- No adapter required, dryer is removed from receiver/dryer on condenser and the opening is sealed. The expansion valve is removed and Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS6338/44  is installed (or an old expansion valve is drilled on and installed as an adapter. Refer to Cleaning The Refrigerant Circuit, Preliminary Work (Flushing With Refrigerant R1234YF) and the Parts Information.
  • Additionally on vehicles 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 44:VAS6338/44  and Refrigerant Circuits Adapter Set 1 - Adapter 43:VAS6338/43  (to seal the refrigerant circuit to the second evaporator)
 Expansion valve is removed from the evaporator in the front of the A/C unit and Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS6338/44  is installed. Expansion valve is removed from the refrigerant lines to the evaporator in the back of the A/C unit and Refrigerant Circuits Adapter Set 1 - Adapter 43:VAS6338/43  is installed.
    To flush the second evaporator and corresponding lines
  • Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS6338/44  and Refrigerant Circuits Adapter Set 1 - Adapter 43:VAS6338/43  (to seal the refrigerant circuit to the evaporator in the front of the A/C unit)
 Expansion valve is removed from the evaporator in the front of the A/C unit and Refrigerant Circuits Adapter Set 1 - Adapter 43:VAS6338/43  is installed. Expansion valve is removed from the refrigerant lines to the evaporator in the back of the A/C unit and Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS6338/44  is installed.
NOTE:

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

On vehicles with two evaporators, the refrigerant circuit with the evaporator in the front of the A/C unit is flushed first. So that the refrigerant flows in a fixed direction when flushing, the refrigerant circuit to the second evaporator (in rear of A/C unit) must be blocked off. This is done by removing the expansion valve in the refrigerant lines to the second evaporator and installing the Refrigerant Circuits Adapter Set 1 - Adapter 43:VAS6338/43  (closed adapter). After the refrigerant circuit with the evaporator is flushed, switch both adapters Refrigerant Circuits Adapter Set 1 - Adapter 43 :VAS6338/43  and Refrigerant Circuits Adapter Set 1 - Adapter 44 :VAS6338/44  and flush the refrigerant circuit with the evaporator in the rear of the A/C unit.

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