Audi A3 e-tron

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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 A3 (8V_/ 85_) from 2017	-- "Denso", "Delphi/Mahle" or "Sanden" compressor manufacturer 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	Receiver/dryer (different versions)-- No adapter necessary, the receiver/dryer remains installed (or is integrated in the condenser).-- Depending on the condenser version, remove the dryer cartridge from the receiver/dryer on the condenser before flushing and then seal the opening again (see note). Refrigerant Circuits Adapter Set - Shut-Off Valve:VAS6338/42	Expansion valve removed and Refrigerant Circuits Adapter Set 1 - Adapter 38:VAS6338/38 installed (or drilled expansion valve, for example 5Q0 820 679 X installed (refer to Cleaning The Refrigerant Circuit, Preliminary Work (Flushing With Refrigerant R1234YF) )) Heater and A/C Unit Refrigerant Shut-Off Valve -N541- and High-Voltage Battery Heater Core Refrigerant Shut-Off Valve -N542- removed and a Shut-Off Valve:VAS6338/42 installed (refer to the notes below). The restrictor in the refrigerant line to the high-voltage battery heat exchanger is removed or the refrigerant line is drilled. (refer to the notes below).
	Required adapter / lines for the connections to the electrically driven A/C compressor (to flush the A/C compressor). Electrically-Driven A/C Compressor, Flushing. Refer to ELECTRICALLY DRIVEN A/C COMPRESSOR, CLEANING .		The refrigerant oil is removed by flushing in the flow direction for electrically-driven A/C compressors (because of the installed valve it is not possible to flush against the flow direction). To flush, arrange the A/C compressor so that the connection for the refrigerant line on the high pressure side is as low as possible.

NOTE:

On the Audi A3 e-tron the refrigerant circuit is flushed in two sections. In the first flushing cycle, the adapter, which is installed for the Heater and A/C Unit Refrigerant Shut-Off Valve -N541-, is opened and the adapter, which is installed for the High-Voltage Battery Heater Core Refrigerant Shut-Off Valve -N542- is closed. Thus the refrigerant circuit with the evaporator in the A/C unit is flushed. In the second flushing cycle, the adapter, which is installed for the Heater and A/C Unit Refrigerant Shut-Off Valve -N541-, is closed and the adapter, which is installed for the High-Voltage Battery Heater Core Refrigerant Shut-Off Valve -N542- is opened. The refrigerant circuit with the evaporator in the high-voltage battery heat exchanger is flushed as a result. Refer to REFRIGERANT CIRCUIT [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB]

This illustration shows a refrigerant line -A- with a permanently installed restrictor -B- (without screen) This refrigerant line is drilled with a suitable drill 5.0 mm to flush the refrigerant circuit (an inserted restrictor is removed) and cleaned in the flushing circuit before installing. The drilled refrigerant line is replaced after flushing. Refer to the Parts Information.

Courtesy of AUDI OF AMERICA, LLC

The diameter of the illustrated restrictor hole -B- is approximately 0.7 mm. Depending on the version of the refrigerant line, this constriction is either permanently installed in the refrigerant line or is only inserted. A screen to separate floating deposits may be installed on the inserted version, which can block the restrictor hole.

The version of the receiver/dryer on the Audi A3 will differ depending on the manufacturer of the condenser. The receiver/dryer is, for example, inside the condenser. The integrated receiver/dryer has a dryer cartridge that is no longer available as a replacement part. If there is a complaint regarding a vehicle with this condenser, it may be necessary to replace the entire condenser after correcting the complaint. Refer to the Parts Information and REFRIGERANT CIRCUIT [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB]

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 [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB]Refrigerant R134a Vapor Pressure Table and the Parts Information.