Audi A8 (4N_) TFSIe from MY 2019

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Vehicle	Required Adapters for the Connections to A/C Compressor	Necessary Adapter for the Connections to the Receiver/Dryer / for the Check Valves and Shut-Off Valves	Miscellaneous
Audi A8 (4N_) TFSIe from MY 2019 Vehicle with one evaporator	-- Compressor manufacturer "Sanden" (block connections with radial sealing) Low pressure side: Refrigerant Circuits Adapter Set 1 - Adapter 12: VAS6338/12 connected to the A/C Service Station and the Refrigerant Circuit Adapter Set - Adapter: VAS6338/48 High pressure side: Refrigerant Circuits Adapter Set 1 - Adapter 3: VAS6338/3	Receiver/Dryer-- 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.
		Check Valves-- The four check valves are removed and installed for the shut-off valves (: 6338/47-1 and : 6338/47-2 ) from the Shut-off Valves: 6338/47 .	The shut-off valves installed for the check valves are opened or closed according to the area to be flushed. Refer to Refrigerant Circuit (vehicle-specific repair information).
		Shut-off valve-- Remove the Refrigerant Shut-Off Valve -V424- and install a Shut-off Valve: VAS6338/42 for it.	Then open or close the shut-off valve installed for the shut-off valve according to the area to be flushed. Replace the Refrigerant Shut-Off Valve -V424- after flushing.

NOTE:

On the Audi A8 TFSIe, the refrigerant circuit is flushed in four steps (flushing cycles). Refer to Refrigerant Circuit (A/C System Refrigerant Circuit, Cleaning).

So that the entire refrigerant circuit can be flushed, not only the installed shut-off valve must be positioned correctly (opened or closed) on the Audi A8 TFSIe, Additionally the electric activated valves (in the valve block) must be positioned correctly. The activation of the electric valves takes place via different routines, which are stored in the respective control module (for example in the Thermal Management Control Module - J1024-). Refer to Refrigerant Circuit (A/C System Refrigerant Circuit, Cleaning).

To flush, the circuit on the Audi A8 TFSIe is divided into multiple sections and then cleaned respectively in a flushing cycle. The division takes place by activating the installed electrically activated valves and via the installed manually activated hand shut-off valves. Refer to Refrigerant Circuit (A/C System Refrigerant Circuit, Cleaning) use the => Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

The design of the different flushing circuits for the Audi A8 TFSIe is described in the vehicle-specific repair information. Refer to Refrigerant Circuit (A/C System Refrigerant Circuit, Cleaning).

Condensers with an integrated receiver/dryer or dryer cartridge that cannot be replaced separately or is not available as a replacement part, the condenser must be replaced after flushing (with the dryer cartridge installed). Refer to Refrigerant Circuit (vehicle-specific repair information) and the Parts Information.

After flushing, the refrigerant receiver on the heat exchanger for heat pump operation must be replaced. Refer to Refrigerant Circuit .

The Refrigerant Shut-Off Valve -V424- must be replaced after flushing. Refer to Refrigerant Circuit .