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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 1035 (Climate Control System (Service Information - Refrigerant R1234YF)) >> 87 Air Conditioning >> Refrigerant Circuit >> Refrigerant Circuit, Cleaning >> Adapter For Assembling Flushing Circuit >> Audi Q7, Audi Q7 e-tron

Audi Q7, Audi Q7 e-tron

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Vehicle Required adapters for the connections to A/C compressor Required adapters for connections to receiver/dryer / to second evaporator Miscellaneous
Audi Q7 (4M_) from MY 2016
  • Vehicle with one evaporator
 -- Compressor manufacturer "Denso" (block connections with radial sealing)
  • Low pressure side Refrigerant Circuits Adapter Set 1 - Adapter 12:VAS6338/12  connected with the A/C Service Station and the Refrigerant Circuits Adapter Set - Adapter 48:VAS6338/48 
  • High pressure side: Refrigerant Circuits Adapter Set 1 - Adapter 3:VAS6338/3 
 -- No adapter required, dryer is removed from receiver/dryer on condenser and the opening is sealed. The expansion valve is removed and Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS6338/44  is installed (or an old expansion valve is drilled on and installed as an adapter. Refer to Cleaning The Refrigerant Circuit, Preliminary Work (Flushing With Refrigerant R1234YF) and the Parts Information.
  • Additionally on vehicles with two evaporators (four zone A/C system)
   To flush the circuit with the evaporator in the front A/C unit
  • Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS6338/44  and Refrigerant Circuits Adapter Set 1 - Adapter 43:VAS6338/43  (to seal the refrigerant circuit to the second evaporator)
 Expansion valve is removed from the evaporator in the front of the A/C unit and Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS6338/44  is installed. Expansion valve is removed from the refrigerant lines to the evaporator in the back of the A/C unit and Refrigerant Circuits Adapter Set 1 - Adapter 43:VAS6338/43  is installed.
    To flush the second evaporator and corresponding lines
  • Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS6338/44  and Refrigerant Circuits Adapter Set 1 - Adapter 43:VAS6338/43  (to seal the refrigerant circuit to the evaporator in the front of the A/C unit)
 Expansion valve is removed from the evaporator in the front of the A/C unit and Refrigerant Circuits Adapter Set 1 - Adapter 43:VAS6338/43  is installed. Expansion valve is removed from the refrigerant lines to the evaporator in the back of the A/C unit and Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS6338/44  is installed.
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.

Vehicle Required adapters for the connections to A/C compressor Necessary adapter for the connections to the receiver/dryer / for the check valves and shut-off valves Miscellaneous
Audi Q7 e-tron (4M_) from MY 2017
  • Vehicle with one evaporator
 -- Compressor manufacturer "Sanden" (block connections with radial sealing)
  • Low pressure side Refrigerant Circuits Adapter Set 1 - Adapter 12:VAS6338/12  connected with the A/C Service Station and the Refrigerant Circuits Adapter Set - Adapter 48:VAS6338/48 
  • High pressure side: Refrigerant Circuits Adapter Set 1 - Adapter 3:VAS6338/3 
 Receiver/Dryer-- No adapter required, dryer is removed from receiver/dryer on condenser and the opening is sealed. The expansion valve is removed and Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS6338/44  is installed (or an old expansion valve is drilled on and installed as an adapter. Refer to Cleaning The Refrigerant Circuit, Preliminary Work (Flushing With Refrigerant R1234YF) .
    Check Valves-- The four check valves are removed and installed for the shut-off valves (:6338/47-1  and :6338/47-2  ) from the Shut-off Valves:6338/47  . The shut-off valves installed for the check valves are opened or closed according to the area to be flushed. Refer to REFRIGERANT CIRCUIT [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB]
    Shut-off valve-- Remove the shut-off valve present and install a Shut-off Valves:VAS6338/42  for it. Then open or close the shut-off valve installed for the shut-off valve according to the area to be flushed.
NOTE:

On the Audi Q7 e-tron the refrigerant circuit is flushed in four steps (flushing circuit). Refer to REFRIGERANT CIRCUIT [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB] (

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 [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB]

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 [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB] and 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 [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB]

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