Audi Q7: Adapter for Assembling Flushing Circuit
- Various adapters which are required to connect the Air
Conditioning (A/C) service station to the refrigerant circuit
for flushing and to bridge the removed receiver/dryer or
reservoir and expansion valve (specific to vehicle) are in the
following table.
- Using a charge hose with 5/8 -18 UNF connections (short
version, for example Refrigerant Circuits Adapter Set 1 -
Adapter 31 -VAS6338/31-), connect the two adapters (contained in
Refrigerant Circuits Adapter Set 1 -VAS6338/1-) which have been
installed for the removed reservoir or receiver/dryer.
- If a flushed refrigerant circuit is not reassembled
immediately after flushing, adapters remain at connections and
seal the connections at the adapters using Refrigerant Circuits
Adapter Set 1 - Adapter 30 -VAS6338/30- (from Refrigerant
Circuits Adapter Set 1 -VAS6338/1-).
- Depending on the version of the compressor and time period
of production, different connection and sealing techniques can
be found for the refrigerant circuit. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- Beginning from production year 2006, the name of the "Zexel"
A/C compressor was changed from "Zexel" to "Valeo".
Block or screw connections
- Screw connection -A-
- Block connection -B-
Block connections with different types of seals
- Block connection with radially sealed connection
-A- (with plastic or metal guide
-B-)
- Block connection with axial sealing connection
-C-
Audi A1 and Audi A2
Note
- The receiver/dryer may be attached to or integrated in the
condenser on the Audi A1/S1, depending on the version of the
condenser. A dryer cartridge is installed in the integrated
receiver/dryer and can be replaced separately. After flushing,
the attached receiver/dryer (introduction still open) must be
replaced after the flushing. Refer to the Parts Catalog and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- There are different versions of the A/C unit (different
heater core and sears different expansion valve etc.) depending
on time period of production and from the VIN number on Audi
A1/S1. Refer to the Parts Catalog. For vehicles with the type
key "8X1" and "8XA" in the VIN number an expansion valve is
installed, on those where both refrigerant lines are attached
above, here the Refrigerant Circuits Adapter Set 1 - Adapter 34
-VAS6338/34- fits. For vehicles with the type key "8XF" and
"8XK" in the VIN number an expansion valve is installed, on
those where both refrigerant lines are attached below, here the
Refrigerant Circuits Adapter Set 1 - Adapter 39 -VAS6338/39-
fits. Refer to
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit; Expansion Valve, Removing and
Installing (vehicle-specific repair manual).
Audi A3, Audi Q3 and Audi TT
Note
- The version of the receiver/dryer on the Audi A3, Audi Q3
and Audi TT will differ depending on the manufacturer of the
condenser. An Audi TT (8J_) from MY 2007 with a 5-cylinder
engine has a different condenser version than on models with a
4- or 6-cylinder engine. 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 are complaints, then it is necessary to replace the
complete condenser. Refer to the Parts Catalog and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- If the receiver/dryer or dryer cartridge is integrated in
the condenser, then it cannot be replaced separately or is not
available as a single part, and the condenser must be replaced.
Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and the Parts Catalog.
Audi A3 e-tron
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 Cut-Off Valve
-N541-, is opened and the adapter, which is installed for the
High Voltage Battery Heater Core Refrigerant Cut-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 Cut-Off Valve -N541-, is closed and the
adapter, which is installed for the High Voltage Battery Heater
Core Refrigerant Cut-Off Valve -N542- is opened. From this the
refrigerant circuit with the evaporator in the high voltage
battery heat exchanger is flushed. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- This illustration shows a refrigerant line
-A- with a permanently installed
restrictor -B- (without a strainer)
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 Catalog.
- The diameter of the illustrated variable orifice
-B- is approximately 0.7 mm.
Depending on the version of the refrigerant line this
constriction is either installed fixed in the refrigerant line
or only inserted. For the inserted version a strainer for
flowing deposits may be installed, which can be blocked by the
variable orifice.
- 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 are complaints,
then it is necessary to replace the complete condenser. Refer to
the Parts Catalog and
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual).
- If the receiver/dryer or dryer cartridge is integrated in
the condenser, then it cannot be replaced separately or is not
available as a single part, and the condenser must be replaced.
Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and the Parts Catalog.
Audi 80, Audi 90, Audi Coupe, Audi Cabriolet and Audi A4
Note
- There are different versions of the receiver/dryer on the
Audi A4 (8K_) from MY 2008, depending on the condenser
manufacturer. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual). The receiver/dryer may be attached to or
integrated in the condenser, depending on the version of the
condenser. The integrated receiver/dryer has a dryer cartridge
that is no longer available as a replacement part. In the event
there is a complaint on a vehicle with this condenser, the
condenser must be completely replaced. Refer to the Parts
Catalog.
- If the receiver/dryer or dryer cartridge is integrated in
the condenser, then it cannot be replaced separately or is not
available as a single part, and the condenser must be replaced.
Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and the Parts Catalog.
Audi A5 Coupe and Sportback, Audi Q5, Audi A5 Cabriolet
Note
- There are different versions of the receiver/dryer on this
vehicle, depending on the condenser manufacturer. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual). The receiver/dryer may be attached to or
integrated in the condenser, depending on the version of the
condenser. The integrated receiver/dryer has a dryer cartridge
that is no longer available as a replacement part. In the event
there is a complaint on a vehicle with this condenser, the
condenser must be completely replaced. Refer to the Parts
Catalog.
- If the receiver/dryer or dryer cartridge is integrated in
the condenser, then it cannot be replaced separately or is not
available as a single part, and the condenser must be replaced.
Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and the Parts Catalog.
Audi Q5 Hybrid
Note
- In vehicles with two evaporators, the refrigerant circuit is
flushed in two/three work steps.
- Currently the expansion valves on the evaporator in the A/C
unit and on the evaporator in the battery cooling module have
the same connections (only the control characteristics and those
on the Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- are
different).
- The refrigerant circuit cannot be rinsed with a Hybrid
Battery Refrigerant Shut-Off Valve 1 -N516- installed in the
circuit to the evaporator in the A/C unit. The Hybrid Battery
Refrigerant Shut-Off Valve 1 -N516- is in a constricted location
and prevents the refrigerant from reaching a sufficient flow
speed. If a Shut-Off Valve -VAS6338/42- is available, install it
for the Hybrid Battery Refrigerant Shut-Off Valve 1 -N516- and
open. If the Shut-Off Valves -VAS6338/42- are not available, but
there are two A/C Adapter Set - Adapters 5 -VAG1785/5- the
circuit with the evaporator in the A/C unit can be rinsed in one
work procedure (reassemble the circuit with a filler hose and
two A/C Adapter Set - Adapters 5 -VAG1785/5-). If the Shut-Off
Valves -VAS6338/42- is not available and there is only one A/C
Adapter Set - Adapters 5 -VAG1785/5- available, the circuit must
be flushed in two steps. From the low pressure connection on the
A/C compressor via the evaporator in the A/C unit up to the
connection for the removed Hybrid Battery Refrigerant Shut-Off
Valve 1 -N516- and from the connection for the removed Hybrid
Battery Refrigerant Shut-Off Valve 1 -N516- via the condenser to
the high pressure connection on the A/C compressor.
- There are different versions of the receiver/dryer on this
vehicle, depending on the condenser manufacturer. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual). The receiver/dryer may be attached to or
integrated in the condenser, depending on the version of the
condenser. The integrated receiver/dryer has a dryer cartridge
that is no longer available as a replacement part. In the event
there is a complaint on a vehicle with this condenser, the
condenser must be completely replaced. Refer to the Parts
Catalog.
- If the receiver/dryer or dryer cartridge is integrated in
the condenser, then it cannot be replaced separately or is not
available as a single part, and the condenser must be replaced.
Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and the Parts Catalog.
Audi 100, Audi A6 (4A_, 4B_ and 4F_), Audi allroad and Audi
V8
Note
The specifications for the Audi A6 (4F_) from MY 2005 also
apply to the Audi S6 and Audi RS 6.
Audi A6 (4G_ or 4X_ for China), Audi A7 (4G_ or 4X_ for
China)
Note
- The type designation 4X_ is used instead of the type
designation 4G_ for specific versions in China
- There are different versions of the receiver/dryer on this
vehicle, depending on the condenser manufacturer. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and the Parts Catalog.
- If the receiver/dryer or dryer cartridge is integrated in
the condenser, then it cannot be replaced separately or is not
available as a single part, and the condenser must be replaced.
Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and the Parts Catalog.
Audi A6 Hybrid
Note
- The type designation 4X_ is used instead of the type
designation 4G_ for specific versions in China
- In vehicles with two evaporators, the refrigerant circuit is
flushed in two/three work steps.
- Currently the expansion valve on the evaporator in the A/C
unit and on the evaporator in the battery cooling module have
the same connections (only the control characteristics and those
on the Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- are
different).
- The refrigerant circuit cannot be rinsed with a Hybrid
Battery Refrigerant Shut-Off Valve 1 -N516- installed in the
circuit to the evaporator in the A/C unit. The Hybrid Battery
Refrigerant Shut-Off Valve 1 -N516- is in a constricted location
and prevents the refrigerant from reaching a sufficient flow
speed. If a Shut-Off Valve -VAS6338/42- is available, install it
for the Hybrid Battery Refrigerant Shut-Off Valve 1 -N516- and
open. If the Shut-Off Valves -VAS6338/42- are not available, but
there are two A/C Adapter Set - Adapters 5 -VAG1785/5- the
circuit with the evaporator in the A/C unit can be rinsed in one
work procedure (reassemble the circuit with a filler hose and
two A/C Adapter Set - Adapters 5 -VAG1785/5-). If the Shut-Off
Valves -VAS6338/42- is not available and there is only one A/C
Adapter Set - Adapters 5 -VAG1785/5- available, the circuit must
be flushed in two steps. From the low pressure connection on the
A/C compressor via the evaporator in the A/C unit up to the
connection for the removed Hybrid Battery Refrigerant Shut-Off
Valve 1 -N516- and from the connection for the removed Hybrid
Battery Refrigerant Shut-Off Valve 1 -N516- via the condenser to
the high pressure connection on the A/C compressor.
- There are different versions of the receiver/dryer on this
vehicle, depending on the condenser manufacturer. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual). The receiver/dryer may be attached to or
integrated in the condenser, depending on the version of the
condenser. The integrated receiver/dryer has a dryer cartridge
that is no longer available as a replacement part. In the event
there is a complaint on a vehicle with this condenser, the
condenser must be completely replaced. Refer to the Parts
Catalog.
- If the receiver/dryer or dryer cartridge is integrated in
the condenser, then it cannot be replaced separately or is not
available as a single part, and the condenser must be replaced.
Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and the Parts Catalog.
- On the Audi A6 hybrid it can be helpful to remove both
refrigerant lines in the engine compartment from the inner heat
exchanger to flush the components in the battery cooling module
and the related refrigerant lines. Then the necessary adapter
and related refrigerant hoses can be installed and remove more
easily. Refer to
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit; System Overview - Refrigerant
Circuit.
- If on the Audi A6 hybrid the knurled nut of the filler hose
on the refrigerant line to the evaporator in the battery cooling
module installed Refrigerant Circuits Adapter Set 1 - Adapter 3
-VAS6338/3- cannot be installed on the connection (depending of
the tolerance on the separation of the refrigerant pipe on the
connection) the refrigerant pipe can be carefully bent
approximately 1 mm to the side.
Audi A8
Note
- In vehicles with two evaporators, the refrigerant circuit is
flushed in two work steps.
- Currently the front and rear expansion valves have the same
connections (only the control characteristics are different)
Drill an additional hole in the Refrigerant Circuits Adapter
Set 1 - Adapter 5 -VAS6338/5- and -VAS6338/11-.
- Drill a hole -A- in addition to
the already existing hole (the dimensions in the illustration
are given in mm).
Rework the Refrigerant Circuits Adapter Set 1 - Adapter 3
-VAS6338/3-
- Sand off or file off the Refrigerant Circuits Adapter Set 1
- Adapter 3 -VAS6338/3- near -A-
without bending the refrigerant pipe (dimensions are in mm).
Audi A8 Hybrid
Note
- In vehicles with two evaporators, the refrigerant circuit is
flushed in two/three work steps.
- Currently the expansion valve on the evaporator in the A/C
unit and on the evaporator in the battery cooling module do not
have the same connections.
- The refrigerant circuit cannot be rinsed with a Hybrid
Battery Refrigerant Shut-Off Valve 1 -N516- installed in the
circuit to the evaporator in the A/C unit. The Hybrid Battery
Refrigerant Shut-Off Valve 1 -N516- is in a constricted location
and prevents the refrigerant from reaching a sufficient flow
speed. If a Shut-Off Valve -VAS6338/42- is available, install
and open it for the Hybrid Battery Refrigerant Shut-Off Valve 1
-N516-. If the Shut-Off Valve -VAS6338/42- is not available, but
there are two A/C Adapter Set - Adapters 5 -VAG1785/5- and the
circuit with the evaporator in the A/C unit can be rinsed in one
work procedure (reassemble the circuit with a filler hose and
two A/C Adapter Set - Adapters 5 -VAG1785/5-). If the Shut-Off
Valves -VAS6338/42- is not available and there is only one A/C
Adapter Set - Adapters 5 -VAG1785/5- available, the circuit must
be flushed in two steps. From the low pressure connection on the
A/C compressor via the evaporator in the A/C unit up to the
connection for the removed Hybrid Battery Refrigerant Shut-Off
Valve 1 -N516- and from the connection for the removed Hybrid
Battery Refrigerant Shut-Off Valve 1 -N516- via the condenser to
the high pressure connection on the A/C compressor.
- There are different versions of the receiver/dryer on this
vehicle, depending on the condenser manufacturer. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual). The receiver/dryer may be attached to or
integrated in the condenser, depending on the version of the
condenser. The integrated receiver/dryer has a dryer cartridge
that is no longer available as a replacement part. In the event
there is a complaint on a vehicle with this condenser, the
condenser must be completely replaced. Refer to the Parts
Catalog.
- If the receiver/dryer or dryer cartridge is integrated in
the condenser, then it cannot be replaced separately or is not
available as a single part, and the condenser must be replaced.
Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual) and the Parts Catalog.
Audi Q7, Audi Q7 e-tron
Note
In vehicles with two evaporators, the refrigerant circuit is
flushed in two work steps.
Note
- 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.
Note
- On the Audi Q7 e-tron the refrigerant circuit is flushed in
four steps (flushing circuit). Refer to
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit (Cleaning the A/C system
refrigerant circuit).
- So that the entire refrigerant circuit can be flushed, on
the Audi Q7 e-tron not only the installed shut-off valve must be
positioned correctly (opened or closed). Additionally the
electrically activated valves (in the valve block) must be
positioned correctly. The activation of the electric valves
takes place via different routines which are stored in the
respective control module (for example in the Thermal Management
Control Module -J1024-). Refer to
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit (Cleaning the A/C system
refrigerant circuit).
- To flush on the Audi Q7 e-tron the refrigerant circuit is
divided into multiple sections and then cleaned respectively in
a flushing cycle. The division takes place by activating the
installed electrically activated valves and via the installed
manually activated hand shut-off valves. Refer to
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit (Cleaning the A/C system
refrigerant circuit) use the Vehicle Diagnostic Tester in the
"Guided Fault Finding" function.
- The design of the different flushing circuits for the Q7 e-tron
is described in the respective vehicle-specific repair manual.
Refer to
→ Heating, Ventilation and Air Conditioning; Rep.
Gr.87; Refrigerant Circuit (Cleaning the A/C system
refrigerant circuit).
Audi R8
Note
- The A/C compressor can only be removed when the engine is
removed on the Audi R8. The refrigerant lines must be removed in
order to be able to flush the refrigerant circuit. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87 ; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual). With the A/C compressor installed the
refrigerant oil quantity in the A/C compressor cannot be
emptied, For this reason flushing the refrigerant circuit with
the A/C compressor installed would not be productive.
- Both installed condensers are flushed in opposite direction
of the refrigerant flow direction.
Note
- Depending on the engine, the A/C compressor can only be
removed when the engine is removed on the Audi R8. The
refrigerant lines must be removed in order to be able to flush
the refrigerant circuit. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87 ; System
Overview - Refrigerant Circuit (vehicle-specific
repair manual). With the A/C compressor installed the
refrigerant oil quantity in the A/C compressor cannot be
emptied, For this reason flushing the refrigerant circuit with
the A/C compressor installed would not be productive.
- Both installed condensers are flushed in opposite direction
of the refrigerant flow direction.
- A short version of the filler hose is also included in the
Refrigerant Circuits Adapter Set 1 -VAS6338/1-.
- The receiver/dryer could potentially be flushed but it will
take too much refrigerant because of its large internal volume;
the receiver/dryer would ice-up too much when extracting the
refrigerant, the refrigerant would evaporate too slowly and
extraction would be prolonged too much.
READ NEXT:
General Information
Vehicles with a High Voltage System (Hybrid Vehicles)
Extremely Dangerous Due to High-Voltage
The high-voltage system is under high-voltage. Death or serious
bodily injury by elec
Vehicles with a High Voltage System (Hybrid Vehicles)
Read and follow all of the supplemental warnings for all
work performed on vehicles with the high voltage system. Refer
to
→ Chapter "Wa
Possible Refrigerant Circuit Concerns
Test Requirements
Electrical Equipment, vacuum system and air duct
fault-finding has not revealed any faults. Refer to Guided Fault
Finding for the A/C system
SEE MORE:
Overview - Charge Door Unit
1 - Drain Hose
For the charge door unit
Removing and Installing. Refer to
→ Chapter "Charge Door Unit Drain Hose, Removing and Installing".
2 - Grommet
3 - Charge Door Unit
Removing and Installing. Refer to
→ Chapter "
Overview - Crankcase Ventilation
1 - Seal
Replace after removing
2 - Oil Separator with Cover
With connection for crankcase ventilation
Removing and installing. Refer to
→ Chapter "Oil Separator, Removing and Installing".
3 - Bolt
9 Nm
4 - O