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. An attached receiver/dryer (introduction TBD) must be replaced after the flushing. Refer to Refrigerant Circuit (R1234yf) .

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. Vehicles with the type keys "8X1" and "8XA" in the VIN have an expansion valve installed, where both refrigerant lines are attached at the top. This is where 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 pipes are attached below, here the Refrigerant Circuits Adapter Set 1 - Adapter 39 :VAS6338/39  fits. Refer to Refrigerant Circuit (R1234yf) .

The version of the receiver/dryer on the Audi Q2, Audi A3, Audi Q3 and Audi TT will differ depending on the manufacturer of the condenser. On some versions for example the receiver/dryer is integrated in the condenser. The integrated receiver/dryer has a dryer cartridge that is no longer available as a replacement part. If there is a complaint regarding a vehicle with a condenser with an integrated receiver/dryer, it may be necessary to replace the entire condenser after correcting the complaint. Refer to Refrigerant Circuit (R1234yf) .

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 (R1234yf) .

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 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 (R1234yf) .

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 drilled refrigerant line is replaced after flushing.

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.

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 is a complaint regarding a vehicle with this condenser, it may be necessary to replace the entire condenser after correcting the complaint. Refer to Refrigerant Circuit (R1234yf) .

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 (R1234yf)

Depending on the condenser manufacturer, the receiver/dryer version for the Audi A4 (8K_) from MY 2017 varies. Refer to Refrigerant Circuit (R1234yf) . . 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.

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 (R1234yf) .

The Audi A4 (type 86_ for China) from MY 2017 currently only offered with refrigerant R134a. If necessary the in refrigerant circuit refrigerant R1234yf can also be used as described for the Audi A4 (8W_) from MY 2017, which for this vehicle is flushed with the adapter described. Refer to Refrigerant Circuit (R1234yf) .

Depending on the condenser manufacturer, the receiver/dryer version for these vehicles varies. Refer to Refrigerant Circuit (R1234yf) . 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.

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 (R1234yf) .

The type designation 4X_ is used instead of the type designation 4G_ for specific versions in China

Depending on the condenser manufacturer, the receiver/dryer version for these vehicles varies. Refer to Refrigerant Circuit (R1234yf) .

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 (R1234yf) .

The Audi A6 e-tron is currently only manufactured in China and not filled with refrigerant R1234yf there (there it will be continued to be filled with refrigerant R134a). Refer to Refrigerant Circuit (R1234yf) .

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 (R1234yf) .

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 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.

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.

On the Audi Q7 e-tron the refrigerant circuit is flushed in four steps (flushing circuit). Refer to Refrigerant Circuit (R1234yf) (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 electric 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 Refrigerant Circuit (R1234yf) (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 Refrigerant Circuit (R1234yf) (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 information. Refer to Refrigerant Circuit (R1234yf) (Cleaning the A/C system refrigerant circuit).

Depending on the engine, the A/C compressor can only be removed when the engine is removed on the Audi R8. To flush the refrigerant circuit, the refrigerant lines can be removed when the A/C compressor is installed. Refer to Refrigerant Circuit (R1234yf) . With the A/C compressor installed the refrigerant oil quantity in the A/C compressor cannot be determined, 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.