Adapter For Assembling Flushing Circuit

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information).

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. 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 EXPANSION VALVE, REMOVING AND INSTALLING and COMPONENT GROUP "2" (vehicle-specific repair information).

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information).

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information) .

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information).

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.

Fig 3: Identifying Refrigerant Line With A Permanently Installed Restrictor

Courtesy of AUDI OF AMERICA, LLC

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information).

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information) .

There are different versions of the receiver/dryer on the Audi A4 (8K_) from MY 2008, depending on the condenser manufacturer. Refer to OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information). 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.

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information)

There are different versions of the receiver/dryer on this vehicle, depending on the condenser manufacturer. Refer to OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information). 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.

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information)

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 and the Hybrid Battery Refrigerant Shut-Off Valve 1 -N516- should not be drilled, 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 and the Hybrid Battery Refrigerant Shut-Off Valve 1 -N516- should not be drilled, 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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information). 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.

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information)

The specifications for the Audi A6 (4F_) from MY 2005 also apply to the Audi S6 and Audi RS 6.

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information)

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information)

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 for the one installed in the circuit to the evaporator in the A/C system for a Hybrid Battery Refrigerant Shut-Off Valve 1 -N516-. The hybrid battery refrigerant shut-off valve 1 -N516- is in a tight spot and prevents the refrigerant from reaching a sufficient flow speed. If a Refrigerant Circuits Adapter Set 1 - Adapter 42 VAS6338/42 is available, install it for the hybrid battery refrigerant shut-off valve 1 -N516- and open. In the event that the Refrigerant Circuits Adapter Set 1 - Adapter 42 VAS6338/42 is not available and there are two A/C Adapter Set - Adapters 5 VAG1785/5 and the hybrid battery refrigerant shut-off valve 1 -N516- cannot be drilled, the circuit with the evaporator in the A/C unit can be rinsed using an additional work procedure (reassemble the circuit with a filler hose and two A/C Adapter Set - Adapters 5 VAG1785/5). If there is no Refrigerant Circuits Adapter Set 1 - Adapter 42 VAS6338/42 available and there is only one A/C Adapter Set - Adapters 5 VAG1785/5 available and the hybrid battery refrigerant shut-off valve 1 -N516- cannot be drilled, the circuit must be flushed in two parts. 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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information). 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.

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information)

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)

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 for the one installed in the circuit to the evaporator in the A/C system for a Hybrid Battery Refrigerant Shut-Off Valve 1 -N516-. The hybrid battery refrigerant shut-off valve 1 -N516- is in a tight spot and prevents the refrigerant from reaching a sufficient flow speed. If a Refrigerant Circuits Adapter Set 1 - Adapter 42 VAS6338/42 is available, install it for the hybrid battery refrigerant shut-off valve 1 -N516- and open, in the event that the Refrigerant Circuits Adapter Set 1 - Adapter 42 VAS6338/42 is not available and there are two A/C Adapter Set - Adapters 5 VAG1785/5 and the hybrid battery refrigerant shut-off valve 1 -N516- cannot be drilled, the circuit with the evaporator in the A/C unit can be rinsed using an additional work procedure (reassemble the circuit with a filler hose and two A/C Adapter Set - Adapters 5 VAG1785/5). If there is no Refrigerant Circuits Adapter Set 1 - Adapter 42 VAS6338/42 available and there is only one A/C Adapter Set - Adapters 5 VAG1785/5 available and the hybrid battery refrigerant shut-off valve 1 -N516- cannot be drilled, the circuit must be flushed in two parts. 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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information). 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.

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information) .

In vehicles with two evaporators, the refrigerant circuit is flushed in two work steps.

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.

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information). 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.

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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information). 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.