Audi Workshop Service and Repair Manuals

Capacities for Audi A6 (4B_) 1998 ► and Audi allroad (4B_) ► 2005

Characteristics of refrigerant circuit:

l	Restrictor

l

Reservoir

l	„Denso“ or „Zexel Valeo“ air conditioner compressor → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual) and → Electronic parts catalogue

Vehicle model	Production period	Capacity in grammes	Differing characteristics of this refrigerant circuit
Audi A6	From 04.97 to 11.97	800 + 50	l  Restrictor not coloured l  Air conditioner unit version „1“ → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). l  Condenser with flat tube dimensions 20 mm x 3 mm → Anchor
	From 11.97 to 08.98	850 + 50	l  Restrictor coloured (yellow) l  Air conditioner unit version „1“ → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). l  Condenser with flat tube dimensions 20 mm x 3 mm → Anchor

t	Restrictors with a modified hole have been installed at the factory since November 1997 (yellow-coloured). The capacity was increased by 50 g for vehicles in which a yellow-coloured restrictor was installed.

t	In order to distinguish between the two restrictor versions, the one with the smaller hole (1.54 mm) is yellow-coloured. The restrictor with the larger hole (1.83 mm) is not coloured.

t

If a vehicle is fitted with a coloured restrictor as replacement for a non-coloured restrictor, add 50 g more refrigerant (refer to table). In addition, the capacity specified on the label in the vehicle is to be checked and amended if necessary or the existing label is to be replaced with one indicating the correct capacity (affix over old label).

t	The Audi A6 is fitted with different air conditioner compressors depending on the engine and production period.

t	In August/September 1998, production was gradually switched from air conditioning unit version „1“ to air conditioning unit version „2“. A reduction in capacity was achieved as the evaporator was also modified together with the air conditioner unit.

t	The two air conditioning unit versions can be identified on the basis of certain characteristics described in the vehicle-specific workshop manual → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual) and → Electronic parts catalogue.

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).

Vehicle model	Production period	Capacity in grammes	Differing characteristics of this refrigerant circuit
Audi A6 l  With 4-cyl. engine l  With 6-cyl. petrol engine	From 08.98 to 04.99	750 + 50	l  Restrictor coloured (yellow) l  Air conditioner unit version „2“ → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). l  Condenser with part no. 4B0 260 401 (403) and index „D“, „E“ or „F“ (flat tube dimensions 20 mm x 3 mm → Anchor) → Electronic parts catalogue.
Audi A6 l  With 6-cyl. diesel engine	t  From 08.98 to 10.98 t  From 12.98 to 10.99 (see notes)	750 + 50	l  Restrictor coloured (yellow) l  Air conditioner unit version „2“ → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). l  Condenser with part no. 4B0 260 401 (403) and index „D“, „E“ or „F“ (flat tube dimensions 20 mm x 3 mm → Anchor) → Electronic parts catalogue.

Vehicle model	Production period	Capacity in grammes	Differing characteristics of this refrigerant circuit
Audi A6/Audi allroad l  With 6-cyl. diesel engine	t  From 10.98 to 12.98 t  From 10.99 onwards (see notes)	550 + 50	l  Restrictor coloured (yellow) l  Air conditioner unit version „2 or 3“ → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). l  Condenser with part no. 4B0 260 401(403) and index „G“ or „R“ (flat tube dimensions 16 mm x 1.7 mm → Anchor) and → Electronic parts catalogue
Audi A6/Audi allroad l  With 4-cyl. engine except 2.0 ltr. l  With 6-cyl. petrol engine except 3.0 ltr. engine l  With 6-cyl. diesel engine (see notes)	From 04.99 onwards	650 + 50	l  Restrictor coloured (yellow) l  Air conditioner unit version „2 or 3“ → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). l  Condenser with part no. 4B0 260 401(403) and index „H“, „J“, „K“, „S“, „T“ or „N“ (flat tube dimensions 18 mm x 1.7 mm → Anchor) and → Electronic parts catalogue.
Audi A6 l  With 2.0 ltr. 4-cyl. engine l  With 3.0 ltr. 6-cyl. engine	From 05.01 onwards	550 + 50	l  Restrictor coloured (yellow) l  Air conditioner unit version „3“ → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). l  Condenser with part no. 8E0 260 401(403) and index A (flat tube dimensions 18 mm x 1.7 mm → Anchor) and → Electronic parts catalogue. l  Air conditioner compressor regulating valve -N280-

t

Condensers with air conditioning system pressure switch -F129- or high-pressure sender -G65- are supplied for factory use as part no. XXX XXX 401 X. This condenser is supplied without an air conditioning system pressure switch -F129- or high-pressure sender -G65- for replacement purposes as part no. XXX XXX 403 X.

t	From 10.98 to 12.98 vehicles with 6-cyl. diesel engine (initially about 10000) were fitted with condensers of a different design. The capacity is different for vehicles with these condensers. The condensers can be identified on the basis of certain characteristics and the part number → Anchor.

t	The Audi A6 is fitted with different air conditioner compressors depending on the engine and production period.

t

On condenser replacement, pay attention to the index of the part number (different flat tube versions, flat tube dimensions 16 mm x 1.7 mm, 18 mm x 1.7 mm or 20 mm x 3 mm) and the different capacities involved. If a condenser with a different part number index is installed, the capacity specified on the label must be checked and amended if necessary or a label indicating the modified capacity must be affixed over the existing label. The part number can be found on a sticker attached to the bottom of the condenser.

t

From 04.99 onwards, production was gradually switched from condensers with flat tube dimensions 20 mm x 3 mm to condensers with flat tube dimensions 18 mm x 1.7 mm or 16 mm x 1.7 mm. The change in production took place gradually during the course of 1999 depending on the engine and existing supplies of the different versions. Refer to the Electronic parts catalogue for precise assignment of the different condensers → Electronic parts catalogue.

t	Vehicles as of 04.99 with 6-cyl. diesel engine may be fitted with a condenser with index „D“, „G“, „R“ or „K“. Observe the different capacities → Air conditioning; Rep. gr.87 (vehicle-specific Workshop Manual) and → Electronic parts catalogue.

Vehicle model	Production period	Capacity in grammes	Differing characteristics of this refrigerant circuit
Audi A6 l  With 8-cyl. engine	l  Up to 03.99 and l  From 02.00 onwards	550 + 50	l  Restrictor coloured (yellow) l  Air conditioner unit version „2 or 3“ → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). l  Condenser with part no. 4B3 260 401 (403) B, D, E (flat tube dimensions 18 mm x 1.7 mm → Anchor) → Electronic parts catalogue.
Audi A6 l  With 8-cyl. engine	From 03.99 to 02.00	650 + 50	l  Restrictor coloured (yellow) l  Air conditioner unit version „2“ → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual). l  Condenser with part no. 4B3 260 401 (403) C (flat tube dimensions 18 mm x 1.7 mm → Anchor) → Electronic parts catalogue.

t	The Audi A6 with 8-cyl. engine is fitted with „Denso“ air conditioner compressors.

t	In August/ September 1998 production was gradually switched from air conditioning unit version „1“ to air conditioning unit version „2“. Vehicles with an 8-cyl. engine are only fitted with air conditioning unit from version „2“ onwards.

t	The different air conditioner unit versions can be identified on the basis of certain characteristics described in the workshop manual → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual).

t	Different condensers were installed in vehicles with 8-cylinder engines. Exclusive use was made for USA vehicles of condensers with part no. 4B3 260 401 (403) C, D, E.

t	In March 1999, production was gradually switched from condensers with part number 4B3 260 401 (403) B to condensers with part number 4B3 260 401 (403) C.

t

If the condenser fitted is replaced by one with a different part number, amend the capacity specified on the label or affix a label with the modified capacity over the existing label. The part number can be found on a sticker attached to the bottom of the condenser → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual) and → Electronic parts catalogue.

Deduct the flat tube dimensions from the condenser   Note t  Production was gradually switched from calendar week 45, 1998 onwards (initially for Audi A6 with 6-cyl. diesel engine) to a condenser with smaller flat tubes. t  Pay attention to the part number on condenser replacement (sometimes the only distinguishing feature) → Electronic parts catalogue.

Condensers -A- with flat tube dimensions -B- = 20 mm and -C- = 3.0 mm must be filled with more refrigerant than condensers -D- with flat tube dimensions -E- = 18 mm or 16 mm and -F- = 1.7 mm → Electronic parts catalogue.

Pay attention to flat tube dimensions if condenser is renewed. If a condenser with different dimensions is to be fitted, also renew label -A- indicating the refrigerant R134a capacity or remove the old capacity and record the new capacity using a waterproof pen → Electronic parts catalogue.