Audi A3 TFSIe (8Y_) from MY 2021

WARNING: This page is about a different car, the 2022 Audi S3, 2022 Audi RS 3, 2022 Audi A3 Quattro, and 2022 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.

Vehicle	Required Adapters for the Connections to A/C Compressor	Adapters Necessary for the Connections to the Reservoir or Receiver/Dryer	Miscellaneous
Audi A3 TFSIe (8Y_) from MY 2021, Audi Q3 TFSIe (F3_) from MY 2021	-- Compressor manufacturer "Hanon" 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 (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 remove and installed with the Refrigerant Circuits - Adapter 38 :VAS6338/38 (or a drilled open expansion valve, refer to PRELIMINARY WORK TO CLEAN REFRIGERANT CIRCUIT (FLUSHING WITH REFRIGERANT R1234YF) - If there is no adapter suitable for the expansion valve in the Passenger Vehicle Adapter Set Volkswagen/Audi, the removed expansion valve can also be drilled open (the old expansion valve must be replaced in most cases and is therefore no longer required). .) 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). Replace the Heater and A/C Unit Refrigerant Shut-Off Valve -N541- and High-Voltage Battery Heater Core Refrigerant Shut-Off Valve -N542- after flushing. 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). Replace after flushing.
	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:

For this vehicle the refrigerant circuit is flushed by diving it into 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 (vehicle-specific Service Information).

The Heater and A/C Unit Refrigerant Shut-Off Valve -N541- and the High-Voltage Battery Heater Core Refrigerant Shut-Off Valve -N542- must be replaced after flushing.

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 refrigerant line or an inserted restrictor must be replaced after flushing. Refer to Parts Information.

Fig 1: Identifying Refrigerant Line With A Permanently Installed Restrictor

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.

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 Service Information) and the Parts Information.