AUDI A8 (4N)
| 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
|
-- Compressor manufacturer "Denso" (block connections with radial sealing)
|
-- 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. |
|
To flush the circuit with the evaporator in the front 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 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
|
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. |
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.