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Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> General Servicing >> Air Conditioning (Refrigerant R134A Servicing) (2 Of 2) >> 87 Air Conditioning >> Refrigerant Circuit General Information >> Connections For Quick-Release Coupling On Refrigerant Circuit >> Connections With Primary Sealing Valve (Ball Valve)

Connections With Primary Sealing Valve (Ball Valve)

WARNING:

Before unscrewing the connection, connect the service station and extract the refrigerant. Refrigerant circuit must be empty to avoid possible injury.

Connection with High-Pressure Valve

Fig 1: Exploded View Of Connection With High-Pressure Valve
GWWV87-1435Courtesy of AUDI OF AMERICA, LLC
  1. Socket with internal thread (soldered in)
  2. O-ring (version and identification: black or colored. Refer to the Parts Information)
  3. Valve with an external thread and groove for the O-ring (identification: ball valve)
  4. Cap seal
  5. Sealing cap

The service connection on the high pressure side depends on the vehicle, not all operating conditions of the A/C system are on high pressure (for example on the Audi Q7 e-tron). For this reason to check the A/C function in these vehicles the sensor installed in the refrigerant circuit must be used. Refer to Refrigerant Circuit and use the Vehicle Diagnostic Tester in the"Guided Fault Finding"  function.

NOTE:

After connecting, install the hand wheel for the service coupling just far enough into the quick-release coupling adapter until the valve is securely opened inside the service connection (pay attention to the pressure gauge, do not put too much pressure on the valve).

For removing and installing the valve -3- when the refrigerant circuit is evacuated, for example, use an adapter from the Refrigerant Sockets :T10364  .

There are different versions of these valves (with internal or external threads). Therefore the tightening specifications can also differ. The valves -3- with an M12 x 1.5 mm external thread have a tightening specification of 9 Nm ±1 Nm.

There are different versions of these valves and their respective caps. Be sure to use the correct valve version and the correct sealing cap allocation. Refer to the Parts Information.

Connection with Low-Pressure Valve

Fig 2: Exploded View Of Connection With Low-Pressure Valve
GWWV87-1434Courtesy of AUDI OF AMERICA, LLC
  1. Socket with an external thread and groove for the O-ring (soldered in)
  2. O-ring (version and identification: black or colored. Refer to the Parts Information)
  3. Valve with an internal thread
  4. Cap seal
  5. Sealing cap
NOTE:

Install the hand wheel for the service coupling just far enough into the quick-release coupling adapter until the valve is securely opened inside the service connection (pay attention to the pressure gauge, do not put too much pressure on the valve).

For removing and installing the valve -3- when the refrigerant circuit is evacuated, for example, use an adapter from the Refrigerant Sockets :T10364  .

There are different versions of these valves (with internal or external threads). Therefore the tightening specifications can also differ. The currently used valves -3- with an M10 x 1.25 mm internal thread have a tightening specification of 9 Nm ± 1 Nm.

There are different versions of these valves and their respective caps. Be sure to use the correct valve version and the correct sealing cap allocation. Refer to the Parts Information.

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