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Quick-Release Coupling Connections On Refrigerant Circuit

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Special Tools And Workshop Equipment Required 

Service Connections With Schrader Valve (Needle Valve Or Push Pin) 

GWWA87-12269Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Allocation in the vehicle. Refer to REFRIGERANT CIRCUIT . .

-- Extract the refrigerant before removing the valves.

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).

The service connections on a R1234yf refrigerant circuit are designed so that the service connections from a R134a refrigerant circuit designed service couplings cannot be connected.

The service connections are for example soldered into a refrigerant line and therefore cannot be replaced separately.

To remove and install the valve insert when the refrigerant circuit is discharged, use, for example, an adapter from the Refrigerant Sockets :T10364  .

Tighten the valve insert very carefully because the tightening specification is very small.

There are different versions of these valves and therefore there are different tightening specifications. Valve insert -C- with a VG5 (5.2 x 0.7 mm, tire valve) thread has a tightening specification of 0.4 Nm ± 0.1 Nm; a valve insert with a M6 x 0.75 mm thread has a tightening specification of 0.9 Nm ± 0.1 Nm, and a valve insert with a M8 x 1.0 mm thread has a tightening specification of 2.0 Nm ± 0.2 Nm.

There are different versions of these valve caps, which means there are different tightening specifications. A valve cap with an M8 x 1 mm or M10 x 1 mm thread has a tightening specification of 0.4 Nm ± 0.1 Nm.

There are different versions of these valves, valve inserts and their caps. Make sure the version of the valve inserts and the allocation of the closure caps is correct.

Service Connection Measurements 

Service Connection Dimensions -B- Refrigerant R134a Service Connection Refrigerant R1234yf Service Connection
High Pressure Side Low Pressure Side High Pressure Side Low Pressure Side
Outer diameter -D1- 16.0 mm 13.0 mm 17.0 mm 14.0 mm
Outer diameter -D2- 14.0 mm 11.0 mm 13.0 mm 12.0 mm
Section -L1- 4.6 mm 6.15 mm 9.0 mm 4.75 mm
Section -L2- 8.16 mm 9.16 mm 12.5 mm 7.2 mm
Valve installation position (not actuated) -C- 6.1 to 7.1 mm 6.1 to 7.1 mm 8.3 to 9.3 mm 8.3 to 9.3 mm

Service Connections with Primary Sealing Valve (Ball Valve)

Allocation in the vehicle. Refer to REFRIGERANT CIRCUIT .

Connection With High-Pressure Valve 

GWWV87-1435Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
  1. Socket with internal thread (soldered in)
  2. Seal (version and identification: black or colored.
  3. Valve with an external thread and groove for the Seal (identification: ball valve)
  4. Closure Cap Seal
  5. Closure Cap
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 caps. Make sure the valve version and the closure cap allocation are correct.

Connection With Low-Pressure Valve 

GWWV87-1434Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
  1. Socket with an External Thread and Groove for Seal (soldered in)
  2. Seal (version and identification: black or colored.
  3. Valve with an internal thread
  4. Closure Cap Seal
  5. Closure 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 caps. Make sure the valve version and the closure cap allocation are correct.

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