Audi Workshop Service and Repair Manuals

Adapters for connecting flushing circuits t  The following table lists the various adapters required for connecting the air conditioner service station to the refrigerant circuit for flushing and for bridging the removed receiver or reservoir and expansion valve (vehicle-specific). t  Use a charging hose with 5/8 - 18 UNF connections (short version e.g. charging hose -VAS 6338/31-) to connect the two adapters fitted in place of the reservoir or receiver removed (contained in VW/Audi passenger vehicle adapter set -VAS 6338/1-). t  If a flushed refrigerant circuit is not supposed to be re-assembled immediately after flushing, leave the adapters in place at the connections and seal the connections at the adapters with the caps -VAS 6338/30- (from the adapter set for refrigerant circuits -VAS 6338/1-). t  Depending on the version of the air conditioner compressor and the production period, use may have been made of different connection and sealing methods at the refrigerant circuit → Heating, air conditioning; Rep. gr.87 or → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). t  The logo of the compressor manufacturer „Zexel“ attached to the air conditioner compressor was modified from „Zexel“ to „Valeo“ from year of production 2006 onwards (change in manufacturer's name).

Block or screw connections –  Screw connection -A- –  Block connection -B- Block connections with different types of seal

–  Block connection with radial seal -A- (with plastic or metal guide -B-) –  Block connection with axial seal -C- Audi A1 and Audi A2

Vehicle	Adapters required for the connections to the air conditioner compressor	Adapters required for reservoir/receiver connections	Other requirements
Audi A1 (8X_) 2011 ►	–  Compressor manufacturer „Denso“, „Sanden“ or „Delphi“ t  Adapter -VAS 6338/12- (low-pressure side) t  High-pressure end Adapter -VAS 6338/3- or Adapter -VAS 6338/2- (depending on the design of the air conditioner compressor and the corresponding refrigerant line)	Different versions –  Version 1 (receiver integrated in condenser): No adapter required; the desiccant bag is removed from the receiver at the condenser and the opening is sealed again for flushing. –  Version 2 (receiver attached to condenser): No adapter required; the receiver is left installed (renewed after flushing).	Expansion valve removed and adapter -VAS 6338/34- fitted (or old expansion valve removed drilled open for flushing and re-installed) → Anchor
Audi A2 (8Z_) 2001 ►	–  Compressor manufacturer „Denso“ t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/2- (high-pressure side)	Reservoir –  Screw connection at inlet Adapter -VAS 6338/9- –  Block connection with axial seal at outlet Adapter -VAS 6338/10-	- Restrictor removed, pipe connections re-assembled

Note On the Audi A1, the receiver may be attached or integrated depending on the version of the condenser. The integrated receiver is fitted with a dryer cartridge which can be renewed separately. If the receiver is of the attached type (introduction not yet finalised), it must be renewed after flushing → Electronic parts catalogue and → Heating, air conditioning; Rep. gr.87. Audi A3, Audi Q3 and Audi TT

Vehicle	Adapters required for the connections to the air conditioner compressor	Adapters required for reservoir/receiver connections	Other requirements
Audi A3 (8L_) 1997 ► Audi TT (8N_) 1999 ►	–  Compressor manufacturer „Sanden“ or „Zexel / Valeo“ t  Adapter -VAS 6338/7- (low-pressure side) t  Adapter -VAS 6338/2- (high-pressure side)	Receiver –  Block connections with axial seal at inlet and outlet Adapter -VAS 6338/2- (2x required)	Expansion valve removed and Adapter -VAS 6338/19- fitted (or drilled-open expansion valve e.g. 6N0 820 679 C fitted → Anchor)
Audi A3 (8P_) 2004 ► Audi TT (8J_) 2007 ► Audi Q3 (8U_) 2012 ►	–  Compressor manufacturer for Audi A3 / Audi Q3 „Sanden“, „Denso“, „Delphi“ or „Zexel / Valeo“ –  Compressor manufacturer for Audi TT „Denso“ t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	Receiver (different versions) –  Adapter not required, receiver remains in position –  Depending on the version of the condenser, it may be necessary to remove the dryer cartridge from the receiver at the condenser before flushing and to seal the opening again (refer to note).	Expansion valve removed and Adapter -VAS 6338/18- (or drilled-open expansion valve e.g. 1K0 820 679) fitted → Anchor

Note t  The design of the receiver on the Audi A3, Audi Q3 and Audi TT differs depending on the condenser manufacturer. The Audi TT with 5-cyl. engine is fitted for example with a different type of condenser to vehicles with a 4 or 6-cyl. engine. This condenser features an integrated receiver for example. The integrated receiver contains a dryer cartridge which is currently not always available as a replacement part. On vehicles fitted with this condenser, it may therefore be necessary to renew the entire condenser after rectifying any problems → Electronic parts catalogue and → Heating, air conditioning; Rep. gr.87. t  In the case of condensers with an integrated receiver / dryer cartridge which cannot be renewed separately or which are not available separately, the condenser is to be renewed after flushing (together with the built-in dryer cartridge) → Heating, air conditioning; Rep. gr.87 and → Electronic parts catalogue. Audi 80 ,Audi 90, Audi Coupé, Audi Cabriolet and Audi A4

Vehicle	Adapters required for the connections to the air conditioner compressor	Adapters required for reservoir connections	Other requirements
Audi 80 (8A_/8C_), Audi Coupé (8B_), Audi Cabriolet (8G_) ► 2002 Audi A4 (8D_) 1995►	–  Compressor manufacturer „Zexel / Valeo“ (screw connections) t  Adapter -VAG 1785/8- (low-pressure side) t  Adapter -VAG 1785/7- (high-pressure side)	Reservoir with different connection versions t  Version „1“ –  Screw connection at inlet Adapter -VAS 6338/9- –  Screw connection at outlet Adapter -VAG 1785/8-	- Restrictor removed, pipe connections re-assembled
	–  Compressor manufacturer „Denso“ (block connections with radial and axial seal) t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/2- (high-pressure side)	t  Version „2“ –  Screw connection at inlet Adapter -VAS 6338/9- –  Block connection with axial seal at outlet Adapter -VAS 6338/10-
Audi A4 (8E_) 2001 ► Audi A4 Cabriolet (8H_) 2003 ►	–  Compressor manufacturer „Denso“ (block connections with radial and axial seal) t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/2- (high-pressure side)	Reservoir with different connection versions t  Version „1“ –  Block connections with axial seal at inlet and outlet t  Adapter -VAS 6338/10- (2x required)	- Restrictor removed, pipe connections re-assembled
	–  Compressor manufacturer „Denso“ (block connections with radial seal) → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual) t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	t  Version „2“ –  Block connections with radial seal at inlet and outlet t  Adapter -VAS 6338/8- (2x required)
Audi A4 (8K_) 2008 ►	–  Compressor manufacturer „Denso“ t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	Receiver (different versions) –  Adapter not required, receiver remains in position –  Depending on the version of the condenser, it may be necessary to remove the dryer cartridge from the receiver at the condenser before flushing and to seal the opening again (refer to note).	Expansion valve removed and Adapter -VAS 6338/36- (or drilled-open expansion valve e.g. 8K0 820 679 A) fitted → Anchor –  The refrigerant line with internal heat exchanger remains in position or is installed again after fitting the adapter.

Note t  The design of the receiver on the Audi A4 (8K_) 2008 > differs depending on the condenser manufacturer → Air conditioning; Rep. gr.87. The receiver may be attached or integrated depending on the version of the condenser. The integrated receiver contains a dryer cartridge which is currently not always available as a replacement part. On vehicles fitted with this condenser, it may therefore be necessary to renew the entire condenser after rectifying any problems → Electronic parts catalogue. t  In the case of condensers with an integrated receiver / dryer cartridge which cannot be renewed separately or which are not available separately, the condenser is to be renewed after flushing (together with the built-in dryer cartridge) → Heating, air conditioning; Rep. gr.87 and → Electronic parts catalogue. Audi A5 Coupé and Sportback, Audi Q5, Audi A5 Cabriolet

Vehicle	Adapters required for the connections to the air conditioner compressor	Adapters required for receiver connections	Other requirements
Audi A5 Coupé and Sportback (8T_) 2008 ► Audi Q5 (8R_) 2008 ► Audi A5 Cabriolet (8F_) 2009 ►	–  Compressor manufacturer „Denso“ t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	Receiver (different versions) –  Adapter not required, receiver remains in position –  Depending on the version of the condenser, it may be necessary to remove the dryer cartridge from the receiver at the condenser before flushing and to seal the opening again (refer to note).	Expansion valve removed and Adapter -VAS 6338/36- (or drilled-open expansion valve e.g. 8K0 820 679 A) fitted → Anchor –  The refrigerant pipe with internal heat exchanger remains in position or is installed again after fitting the adapter.

Note t  The design of the receiver differs on these vehicles depending on the condenser manufacturer → Air conditioning; Rep. gr.87. The receiver may be attached or integrated depending on the version of the condenser. The integrated receiver contains a dryer cartridge which is currently not always available as a replacement part. On vehicles fitted with this condenser, it may therefore be necessary to renew the entire condenser after rectifying any problems → Electronic parts catalogue. t  In the case of condensers with an integrated receiver / dryer cartridge which cannot be renewed separately or which are not available separately, the condenser is to be renewed after flushing (together with the built-in dryer cartridge) → Heating, air conditioning; Rep. gr.87 and → Electronic parts catalogue. Audi Q5 hybrid

Vehicle	Adapters required for connections to/at air conditioner compressor	Adapters required for receiver connections	Other requirements
Audi Q5 (8R_) 2011 ►	Adapters required for the connections to the air conditioner compressor –  Compressor manufacturer „Denso“ t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	Receiver (different versions) –  Adapter not required, receiver remains in position –  Depending on the version of the condenser, it may be necessary to remove the dryer cartridge from the receiver at the condenser before flushing and to seal the opening again (refer to note).	Expansion valve removed and Adapter -VAS 6338/36- (or drilled-open expansion valve e.g. 8K0 820 679 A) fitted → Anchor –  The refrigerant line with internal heat exchanger remains in position or is installed again after fitting the adapter.
t  Additionally for vehicles with battery cooling module		For flushing the circuit with the evaporator in the air conditioning unit and the condenser t  Adapter -VAS 6338/5- for sealing the „low-pressure end“ connection (to the second evaporator in the battery cooling module) t  Adapter -VAS 6338/11- for sealing the „high-pressure end“ connection (to the second evaporator in the battery cooling module) t  Adapter -VAG 1785/5- (refer to notes)	There are various ways of flushing the circuit t  Refrigerant shut-off valve 1 for hybrid battery -N516- removed, drilled open, cleaned and re-installed (similar to expansion valve → Anchor) t  Flushing of circuit in one or two operations (refer to notes)
		For flushing the evaporator in the battery cooling module and the corresponding lines t  Adapter -VAS 6338/3- for connecting the air conditioner service station to the „low-pressure end“ connection (to the second evaporator). t  Adapter -VAS 6338/4- for connecting the air conditioner service station to the „high-pressure end“ connection (to the second evaporator).	Expansion valve in refrigerant lines to second evaporator removed and adapter -VAS 6338/36- fitted (or old expansion valve removed drilled open for flushing and re-installed → Anchor).
	Adapters / lines required for connections at electrically driven air conditioner compressor (for flushing air conditioner compressor) t  Adapter -VAS 6338/12- for low-pressure side and and refrigerant line from vehicle (e.g. 7L6 820 744 AD) → Electronic parts catalogue t  Adapter -VAS 6338/3- for high-pressure side and and refrigerant line (e.g. 7L6 820 721 BF or 4G0 260 701 AB) → Electronic parts catalogue		t  On the electrically driven air conditioner compressor, the refrigeration oil is to be removed by flushing in the direction of flow (it is not possible to flush in the opposite direction due to the valves installed) t  For the flushing procedure, position the air conditioner compressor so that the connection for the refrigerant line on the high-pressure side is as low down as possible

Note t  On vehicles with two evaporators, the refrigerant circuit is flushed in two / three steps. t  Currently the connections on the expansion valves at the evaporator in the air conditioning unit and at the evaporator in the battery cooling module are identical; the only differences are the control characteristics and the refrigerant shut-off valve 2 for hybrid battery -N517-. t  If a refrigerant shut-off valve 1 for hybrid battery -N516- is installed in the circuit to the evaporator in the air conditioning unit, the refrigerant circuit cannot be flushed. -N516- forms a constriction and prevents the refrigerant from flowing through at an adequate rate. If there are two adapters -VAG 1785/5- and the -N516- should not be drilled open, the circuit can be flushed with the evaporator in the air conditioning unit in one work step (re-assemble circuit with one charging hose and two adapters -VAG 1785/5-). If there is only one adapter -VAG 1785/5- and -N516- should not be drilled open, the circuit must be flushed in two separate work steps: from the low-pressure connection on the air conditioner compressor via the evaporator in the air conditioning unit to the connection for -N516- (removed) and from the connection for -N516- (removed) via the condenser to the high-pressure connection on the air conditioner compressor. t  The design of the receiver differs on these vehicles depending on the condenser manufacturer → Air conditioning; Rep. gr.87. The receiver may be attached or integrated depending on the version of the condenser. The integrated receiver contains a dryer cartridge which is currently not always available as a replacement part. On vehicles fitted with this condenser, it may therefore be necessary to renew the entire condenser after rectifying any problems → Electronic parts catalogue. t  In the case of condensers with an integrated receiver / dryer cartridge which cannot be renewed separately or which are not available separately, the condenser is to be renewed after flushing (together with the built-in dryer cartridge) → Heating, air conditioning; Rep. gr.87 and → Electronic parts catalogue. Audi 100, Audi A6 (4A_, 4B_ and 4F_), Audi allroad and Audi V8

Vehicle	Adapters required for the connections to the air conditioner compressor	Adapters required for reservoir connections	Other requirements
Audi 100 / Audi A6 (4A_) ► 1998 Audi A6 (4B_) 1998 ► Audi allroad (4B_) ► 2005 Audi V8 (4C_) ► 1994	–  Compressor manufacturer „Zexel / Valeo“ (screw connections) t  Adapter -VAG 1785/8- (low-pressure side) t  Adapter -VAG 1785/7- (high-pressure side)	Reservoir with different connection versions t  Version „1“ –  Screw connection at inlet Adapter -VAS 6338/9- –  Screw connection at outlet Adapter -VAG 1785/8-	- Restrictor removed, pipe connections re-assembled
	–  Compressor manufacturer „Denso“ (block connections with radial and axial seal) t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/2- (high-pressure side)	t  Version „2“ –  Screw connection at inlet Adapter -VAS 6338/9- –  Block connection with axial seal at outlet Adapter -VAS 6338/10- t  Version „3“ –  Block connections with axial seal at inlet and outlet Adapter -VAS 6338/10- (2x required)
Audi A6 (4F_) 2005 ►	–  Compressor manufacturer „Denso“ (block connections with radial seal) t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	–  Reservoir with block connections with radial seal at inlet and outlet t  Adapter -VAS 6338/8- (2x required)	- Restrictor removed, pipe connections re-assembled

Note The specifications for the Audi A6 (4F_) 2005 ► also apply to the Audi S6 and Audi RS 6. Audi A6 (4G_), Audi A7

Vehicle	Adapters required for the connections to the air conditioner compressor	Adapters required for receiver connections	Other requirements
Audi A6 (4G_) 2011 ► Audi A7 (4G_) 2011 ►	–  Compressor manufacturer „Denso“ t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	Receiver (different versions) –  Adapter not required, receiver remains in position –  Depending on the version of the condenser, it may be necessary to remove the dryer cartridge from the receiver at the condenser before flushing and to seal the opening again (refer to note).	Expansion valve removed and adapter -VAS 6338/36- fitted (or old expansion valve removed drilled open for flushing and re-installed → Anchor).

Note t  The design of the receiver differs on these vehicles depending on the condenser manufacturer → Air conditioning; Rep. gr.87 and → Electronic parts catalogue. t  In the case of condensers with an integrated receiver / dryer cartridge which cannot be renewed separately or which are not available separately, the condenser is to be renewed after flushing (together with the built-in dryer cartridge) → Air conditioning; Rep. gr.87 and → Electronic parts catalogue. Audi A6 hybrid

Vehicle	Adapters required for connections to/on air conditioner compressor	Adapters required for receiver connections	Other requirements
Audi A6 (4G_) 2012 ►	Adapters required for connections to air conditioner compressor –  Compressor manufacturer „Denso“ t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	Receiver (different versions) –  Adapter not required, receiver remains in position –  Depending on the version of the condenser, it may be necessary to remove the dryer cartridge from the receiver on the condenser before flushing and to seal the opening again (see note).	Expansion valve removed and adapter -VAS 6338/36- (or old, drilled-out and cleaned expansion valve → Anchor) installed. –  Refrigerant line with internal heat exchanger is not removed or is re-installed after installation of adapter.
t  Additionally for vehicles with battery cooling module		For flushing circuit with evaporator in front air conditioning unit and condenser t  Adapter -VAS 6338/5- for sealing connection on low-pressure side (to second evaporator in battery cooling module) t  Adapter -VAS 6338/11- for sealing connection on high-pressure side (to second evaporator in battery cooling module) t  Adapter -VAG 1785/5- (see notes)	There are various ways of flushing the circuit: t  Refrigerant shut-off valve 1 for hybrid battery -N516- removed, drilled open, cleaned and re-installed (similar to expansion valve → Anchor) t  Flushing the circuit in one or two steps (see notes)
		To flush the evaporator in the battery cooling module and the attached lines t  Adapter -VAS 6338/3- for connecting air conditioner service station to connection on low-pressure side (to second evaporator). t  Adapter -VAS 6338/4- for connecting air conditioner service station to connection on high-pressure side (to second evaporator).	Expansion valve in refrigerant lines to second evaporator removed and adapter -VAS 6338/36- installed (or old expansion valve removed, drilled open for flushing and re-installed → Anchor).
	Adapters / lines required for connections on electrically driven air conditioner compressor (for flushing air conditioner compressor) t  Adapter -VAS 6338/12- for low-pressure side or -VAS 6338/8- (depending on refrigerant line) and refrigerant line from vehicle (or e.g. 7L6 820 744 AD) → Electronic parts catalogue t  Adapter -VAS 6338/3- for high-pressure side and and refrigerant line (e.g. 7L6 820 721 BF or 4G0 260 701 AB) → Electronic parts catalogue		t  On the electrically driven air conditioner compressor, the refrigeration oil is to be removed by flushing in the direction of flow (it is not possible to flush in the opposite direction due to the valves installed) t  For the flushing procedure, position the air conditioner compressor so that the connection for the refrigerant line on the high-pressure side is as low down as possible

Note t  On vehicles with two evaporators, the refrigerant circuit is flushed in two / three steps. t  Currently the connections on the expansion valves at the evaporator in the air conditioning unit and at the evaporator in the battery cooling module are identical; the only differences are the control characteristics and the refrigerant shut-off valve 2 for hybrid battery -N517-. t  If a refrigerant shut-off valve 1 for hybrid battery -N516- is installed in the circuit to the evaporator in the air conditioning unit, the refrigerant circuit cannot be flushed. -N516- forms a constriction and prevents the refrigerant from flowing through at an adequate rate. If there are two adapters -VAG 1785/5- and the -N516- should not be drilled open, the circuit can be flushed with the evaporator in the air conditioning unit in one work step (re-assemble circuit with one charging hose and two adapters -VAG 1785/5-). If there is only one adapter -VAG 1785/5- and -N516- should not be drilled open, the circuit must be flushed in two separate work steps: from the low-pressure connection on the air conditioner compressor via the evaporator in the air conditioning unit to the connection for -N516- (removed) and from the connection for -N516- (removed) via the condenser to the high-pressure connection on the air conditioner compressor. t  The design of the receiver varies on these vehicles depending on the manufacturer of the condenser → Air conditioning; Rep. gr.87. Depending on the version of the condenser, the receiver may be attached to or integrated into the condenser. The integrated receiver contains a dryer cartridge which is currently not always available as a replacement part. Therefore it may be necessary to renew the condenser after eliminating any faults on vehicles fitted with this condenser → Electronic parts catalogue. t  On vehicles with condensers with an integrated receiver / dryer cartridge which cannot be renewed separately or which are not available as separate replacement parts, the condenser must be renewed after flushing (together with integrated dryer cartridge) → Heating, air conditioning; Rep. gr.87 and → Electronic parts catalogue. Audi A8

Vehicle	Adapters required for the connections to the air conditioner compressor	Adapters required for reservoir connections	Other requirements
Audi A8 (4D_) 1994 ►	–  Compressor manufacturer „Zexel / Valeo“ (screw connections) t  Adapter -VAG 1785/8- (low-pressure side) t  Adapter -VAG 1785/7- (high-pressure side)	Reservoir with different connection versions t  Version „1“ –  Screw connection at inlet Adapter -VAS 6338/9- –  Screw connection at outlet Adapter -VAG 1785/8-	- Restrictor removed, pipe connections re-assembled
	–  Compressor manufacturer „Denso“ (block connections with radial and axial seal) t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/2- (high-pressure side)	t  Version „2“ –  Screw connection at inlet Adapter -VAS 6338/9- –  Block connection with axial seal at outlet Adapter -VAS 6338/10- t  Version „3“ –  Block connections with axial seal at inlet and outlet Adapter -VAS 6338/10- (2x required)
Audi A8 (4E_) 2003 ►	–  Compressor manufacturer „Denso“ (block connections with radial seal) t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	Reservoir –  Block connections with radial seal at inlet and outlet t  Adapter -VAS 6338/8- (2x required)	- Restrictor removed, pipe connections re-assembled
Audi A8 (4H_) 2010 ►	–  Compressor manufacturer „Denso“ (block connections with radial seal) t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	–  No adapter required, the desiccant bag is removed from the receiver at the condenser and the opening sealed off again for flushing.	Expansion valve removed and adapter -VAS 6338/18- fitted (or old expansion valve removed drilled open for flushing and re-installed → Anchor).
t  Additionally for vehicles with 2 evaporators (4-zone air conditioner)		For flushing circuit with evaporator in front air conditioning unit t  Adapter -VAS 6338/5- for sealing connection („low-pressure side“) to second evaporator t  Adapter -VAS 6338/11- for sealing connection („high-pressure side“) to second evaporator) l  An additional hole may have to be made in the adapters (see below) to be able to seal the refrigerant lines with the adapters -VAS 6338/5- and -VAS 6338/11-
		For flushing second evaporator and corresponding pipes t  Adapter -VAS 6338/3- for connecting the air conditioner service station to the „low-pressure end“ connection (to the second evaporator). t  Adapter -VAS 6338/4- for connecting the air conditioner service station to the „high-pressure end“ connection (to the second evaporator). l  The adapter may have to be reworked (see below) to be able to connect the refrigerant line to the adapter -VAS 6338/3-	Expansion valve in refrigerant lines to second evaporator removed and adapter -VAS 6338/18- fitted (or old expansion valve removed drilled open for flushing and re-installed → Anchor).

Note t  On vehicles with two evaporators, the refrigerant circuit is flushed in two operations. t  At present the front and rear expansion valves have identical connections (only the control characteristic differs). Making additional hole in adapters -VAS 6338/5- and -VAS 6338/11-

–  Make a hole -A- in addition to the hole provided (the dimensions in the illustration are given in mm). Reworking adapter -VAS 6338/3-

–  By grinding or filing off material in area -A-, rework the adapter -VAS 6338/3- such that it can be connected without bending the refrigerant line (the dimensions in the illustration are given in mm). Audi A8 hybrid

Vehicle	Adapters required for connections to/on air conditioner compressor	Adapters required for receiver connections	Other requirements
Audi A8 (4H_) 2012 ►	Adapters required for connections to air conditioner compressor –  Compressor manufacturer „Denso“ t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	Receiver (different versions) –  Adapter not required, receiver remains in position –  Depending on the version of the condenser, it may be necessary to remove the dryer cartridge from the receiver on the condenser before flushing and to seal the opening again (see note).	Expansion valve removed and adapter -VAS 6338/18- (or old, drilled-out and cleaned expansion valve → Anchor) installed. –  Refrigerant line with internal heat exchanger is not removed or is re-installed after installation of adapter.
t  Additionally for vehicles with battery cooling module		For flushing circuit with evaporator in front air conditioning unit and condenser t  Adapter -VAS 6338/5- for sealing connection on low-pressure side (to second evaporator in battery cooling module) t  Adapter -VAS 6338/11- for sealing connection on high-pressure side (to second evaporator in battery cooling module) t  Adapter -VAG 1785/5- (see notes)	There are various ways of flushing the circuit: t  Refrigerant shut-off valve 1 for hybrid battery -N516- removed, drilled open, cleaned and re-installed (similar to expansion valve → Anchor) t  Flushing the circuit in one or two steps (see notes)
		To flush the evaporator in the battery cooling module and the attached lines t  Adapter -VAS 6338/3- for connecting air conditioner service station to connection on low-pressure side (to second evaporator). t  Adapter -VAS 6338/4- for connecting air conditioner service station to connection on high-pressure side (to second evaporator).	Expansion valve in refrigerant lines to second evaporator removed and adapter -VAS 6338/36- installed (or old expansion valve removed, drilled open for flushing and re-installed → Anchor).
	Adapters / lines required for connections on electrically driven air conditioner compressor (for flushing air conditioner compressor) t  Adapter -VAS 6338/12- for low-pressure side or -VAS 6338/8- (depending on refrigerant line) and refrigerant line (e.g. 4G0 260 707 AG or 7L6 820 744 AD) → Electronic parts catalogue t  Adapter -VAS 6338/3- for high-pressure side and and refrigerant line (e.g. 7L6 820 721 BF or 4G0 260 701 AB) → Electronic parts catalogue		t  On the electrically driven air conditioner compressor, the refrigeration oil is to be removed by flushing in the direction of flow (it is not possible to flush in the opposite direction due to the valves installed) t  For the flushing procedure, position the air conditioner compressor so that the connection for the refrigerant line on the high-pressure side is as low down as possible

Note t  On vehicles with two evaporators, the refrigerant circuit is flushed in two / three steps. t  Currently the expansion valve at the evaporator in the air conditioning unit and at the evaporator in the battery cooling module do not have the same connections. t  If a refrigerant shut-off valve 1 for hybrid battery -N516- is installed in the circuit to the evaporator in the air conditioning unit, the refrigerant circuit cannot be flushed. -N516- forms a constriction and prevents the refrigerant from flowing through at an adequate rate. If there are two adapters -VAG 1785/5- and the -N516- should not be drilled open, the circuit can be flushed with the evaporator in the air conditioning unit in one work step (re-assemble circuit with one charging hose and two adapters -VAG 1785/5-). If there is only one adapter -VAG 1785/5- and -N516- should not be drilled open, the circuit must be flushed in two separate work steps: from the low-pressure connection on the air conditioner compressor via the evaporator in the air conditioning unit to the connection for -N516- (removed) and from the connection for -N516- (removed) via the condenser to the high-pressure connection on the air conditioner compressor. t  The design of the receiver varies on these vehicles depending on the manufacturer of the condenser → Air conditioning; Rep. gr.87. Depending on the version of the condenser, the receiver may be attached to or integrated into the condenser. The integrated receiver contains a dryer cartridge which is currently not always available as a replacement part. Therefore it may be necessary to renew the condenser after eliminating any faults on vehicles fitted with this condenser → Electronic parts catalogue. t  On vehicles with condensers with an integrated receiver / dryer cartridge which cannot be renewed separately or which are not available as separate replacement parts, the condenser must be renewed after flushing (together with integrated dryer cartridge) → Heating, air conditioning; Rep. gr.87 and → Electronic parts catalogue. Audi Q7

Vehicle	Adapters required for the connections to the air conditioner compressor	Adapters required for connections to receiver / to second evaporator	Other requirements
Audi Q7 (4L_) 2006 ► t  Vehicle with one evaporator (2 zone air conditioner)	–  Compressor manufacturer „Denso“ (block connections with radial seal) t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	–  No adapter required, the dryer is removed from the receiver at the condenser and the opening sealed off again.	Expansion valve removed and adapter -VAS 6338/17- or adapter -VAS 6338/33- fitted depending on version of expansion valve (or drilled-open expansion valve e.g. 7L0 820 712 A, 7H0 820 679 B or 7L0 820 679 C fitted → Anchor) → Electronic parts catalogue.
t  Additionally for vehicles with 2 evaporators (4-zone air conditioner)		For flushing circuit with evaporator in front air conditioning unit t  Adapter -VAS 6338/5- for sealing connection („low-pressure side“) to second evaporator t  Adapter -VAS 6338/11- for sealing connection („high-pressure side“) to second evaporator)
		For flushing second evaporator and corresponding pipes t  Adapter -VAS 6338/3- for connecting the air conditioner service station to the „low-pressure end“ connection (to the second evaporator). t  Adapter -VAS 6338/4- for connecting the air conditioner service station to the „high-pressure end“ connection (to the second evaporator).	Expansion valve at second evaporator removed and Adapter -VAS 6338/17- fitted (or drilled-open expansion valve e.g. 7L0 820 712 A fitted → Anchor) → Electronic parts catalogue

Note On vehicles with two evaporators, the refrigerant circuit is flushed in two operations. Audi R8

Vehicle	Adapters required for the connections to the air conditioner compressor	Adapters required for reservoir connections	Other requirements
Audi R8 (42_) 2008 ►	–  Compressor manufacturer „Denso“ (block connections with radial seal) t  Adapter -VAS 6338/12- (low-pressure side) t  Adapter -VAS 6338/3- (high-pressure side)	Reservoir –  Block connections with radial seal at inlet and outlet t  Adapter -VAS 6338/8- (2x required)	- Restrictor removed, pipe connections re-assembled

Note t  On the Audi R8, the engine must be removed to renew the air conditioner compressor. For flushing the refrigerant circuit, the refrigerant pipes can however be detached without removing the air conditioner compressor → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). t  The two condensers are flushed in situ in the direction opposite to that of the refrigerant flow.