Get General information on refrigerant circuit -> Connections for quick-release coupling in refrigerant circuit Guide for Audi A2 SUV 1999-2005

Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...

Air conditioner with refrigerant R134a - Edition 11.2018

9 - Service connection (low-pressure side)

3.5

Connections for quick-release coupling

in refrigerant circuit

•

Only use valves and connections that are resistant to R134a

refrigerant and related refrigerant oils.

There are different connections (outer diameter) for high and

low-pressure sides.

Discharge refrigerant circuit before removing valves or valve

cores.

Always screw on sealing caps.

Layout in vehicle ⇒ Heating, air conditioning; Rep. gr. 87 ; Re‐

frigerant circuit (vehicle-specific Workshop Manual)

WARNING

Risk of injury (frostbite).

Refrigerant may escape if the refrigerant circuit has not been

discharged.

Extract refrigerant before opening refrigerant circuit. Renewed

evaporation may create pressure in refrigerant circuit if refrig‐

erant circuit is not opened within 10 minutes following extrac‐

tion. Extract refrigerant again.

3. General information on refrigerant circuit

51

Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...

Air conditioner with refrigerant R134a - Edition 11.2018

⇒ “3.5.1 Connections with Schrader valve (needle valve)”,

page 52

⇒ “3.5.2 Connections with primary sealing valve (ball valve)”,

page 52

⇒ “3.5.3 Differences in service connections depending on refrig‐

erant (R134a or R1234yf)”, page 55

3.5.1

Connections with Schrader valve (nee‐

dle valve)

♦ -A- Service connection (soldered in)

♦ -B- Valve core (designation: Schrader valve or needle valve)

♦ -C- O-ring (for valve)

♦ -D- Sealing cap with seal

Note

♦ After connecting, carefully screw handwheel of service cou‐

pling into quick-release coupling adapter only to the extent

required to reliably open valve in service connection (observe

pressure gauge; do not open valve too far).

♦ When removing and installing valve core -B- with refrigerant

circuit discharged, use e.g. adapter from socket - T10364- .

♦ Take care when tightening valve core -B- (low torque).

♦ There are different versions of these valves; therefore tight‐

ening torques vary. For a valve core -B- with a VG5 thread

(5.2 x 0.7 mm, tyre valve) the tightening torque is 0.4 Nm

+/- 0.1 Nm; for a valve core with an M6 x 0.75 mm thread, the

tightening torque is 0.9 Nm +/- 0.1 Nm, and for a valve core

with an M8 x 1.0 mm thread, the tightening torque is

2.0 Nm +/- 0.2 Nm.

♦ There are different versions of these valves, valve cores and

corresponding sealing caps. Note the correct version of the

valve core and correct assignment of the sealing caps ⇒ Elec‐

tronic parts catalogue .

3.5.2

Connections with primary sealing valve

(ball valve)

WARNING

Before unscrewing the connection, connect the air conditioner

service station and extract refrigerant. The refrigerant circuit

must be empty; danger of injury.

52

Rep. gr.87 - Air conditioning system

Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...

Air conditioner with refrigerant R134a - Edition 11.2018

Connection with high-pressure valve

1 - Connection with internal thread (soldered in)

2 - O-ring (version and identification: black or coloured ⇒ Elec‐

tronic parts catalogue )

3 - Valve with external thread and groove for O-ring (designa‐

tion: ball valve)

4 - Seal for cap

5 - Cap

Depending on the vehicle, high pressure may not be available at

the service connection on the high-pressure side in all air condi‐

tioner operating modes (e.g. on the Audi Q7 e-tron). The senders

installed in the refrigerant circuit must therefore be used to check

that the air conditioner in these vehicles is functioning properly ⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-

specific Workshop Manual) and ⇒ Vehicle diagnostic tester in

“Guided Fault Finding” mode.

Note

♦ After connecting, carefully screw handwheel of service cou‐

pling into quick-release coupling adapter only to the extent

required to reliably open valve in service connection (observe

pressure gauge; do not open valve too far).

♦ When removing and installing valve -3- with refrigerant circuit

discharged, use e.g. an adapter from socket - T10364- .

♦ There are different versions of these valves (with internal or

external thread); therefore the tightening torques may vary.

For the valves -3- currently in use (external thread M12 x 1.5

mm) the tightening torque is 9 Nm +/- 1 Nm.

♦ There are different versions of these valves and the corre‐

sponding sealing caps. Note the correct version of the valve

and correct assignment of the sealing cap ⇒ Electronic parts

catalogue .

3. General information on refrigerant circuit

53

Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...

Air conditioner with refrigerant R134a - Edition 11.2018

Connection with low-pressure valve

1 - Connection with external thread and groove for O-ring (sol‐

dered in)

2 - O-ring (version and identification: black or coloured ⇒ Elec‐

tronic parts catalogue )

3 - Valve with internal thread

4 - Seal for cap

5 - Cap

Note

♦ Screw handwheel of service coupling into quick-release cou‐

pling adapter carefully and only to the extent required to

reliably open valve in service connection (observe pressure

gauge; do not open valve too far).

♦ When removing and installing valve -3- with refrigerant circuit

discharged, use e.g. an adapter from socket - T10364- .

♦ There are different versions of these valves (with internal or

external thread); therefore the tightening torques may vary.

For the valves -3- currently in use (internal thread

M10 x 1.25 mm) the tightening torque is 9 Nm +/- 1 Nm.

♦ There are different versions of these valves and the corre‐

sponding sealing caps. Note the correct version of the valve

and correct assignment of the sealing cap ⇒ Electronic parts

catalogue .

54

Rep. gr.87 - Air conditioning system

Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...

Air conditioner with refrigerant R134a - Edition 11.2018

3.5.3

Differences in service connections de‐

pending on refrigerant (R134a or

R1234yf)

Note

♦ Only use valves and connections which are resistant to the

corresponding refrigerant (R134a and/or R1234yf) and related

refrigerant oils ⇒ Electronic parts catalogue .

♦ The service connections for the refrigerant circuits are de‐

signed such that only the specified service couplings for the

specified refrigerant (R134a or R1234yf) can be connected.

♦ These illustrations show service connections in which a

Schrader valve (needle valve or push pin) is installed. How‐

ever, depending on the vehicle version or the type of refriger‐

ant etc., service connections with a primary sealing valve (ball

valve) may also be installed (different technology)

⇒ “3.5.2 Connections with primary sealing valve (ball valve)”,

page 52 .

♦ Layout in vehicle and on refrigerant circuit ⇒ Heating, air con‐

ditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-specific

Workshop Manual).

♦ There are different connections (outer diameter) for high and

low-pressure sides.

♦ Discharge refrigerant circuit before removing valves or valve

cores

⇒ “5.3.3 Discharging refrigerant circuit with air conditioner

service station”, page 84 .

♦ Removing and installing valve from service connection (low

and high-pressure sides)

⇒ “3.5.1 Connections with Schrader valve (needle valve)”,

page 52 .

♦ Always screw on sealing caps with seal.

3. General information on refrigerant circuit

55

Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...

Air conditioner with refrigerant R134a - Edition 11.2018

Service connections (refrigerant R134a and R1234yf)

WARNING

Before removing valves -B, E-, connect the air conditioner

service station and extract refrigerant. Refrigerant circuit must

be

empty;

danger

of

injury

⇒ “5.3.3 Discharging refrigerant circuit with air conditioner

service station”, page 84 .

♦ Cap for service connection (high-pressure side) -A- with seal

-G-

♦ Valve core on high-pressure side (version: Schrader valve or

needle valve) -B-

♦ Service connection (high-pressure side) -C-

♦ Cap for service connection (low-pressure side) -D- with seal

-G-

♦ Valve core on low-pressure side (version: Schrader valve or

needle valve) -E-

♦ Service connection (low-pressure side) -F-

Note

♦ Service connections -C, F- for refrigerant R134a and R1234yf

are available in different versions (depending on manufactur‐

er), with different sealing caps -A, D- and valves -B, E-. Ensure

correct assignment ⇒ Electronic parts catalogue .

♦ Sealing caps -A, D- for the service connections on the R134a

refrigerant circuit are currently black. The sealing caps for the

service connections on the R1234yf refrigerant circuit are cur‐

rently grey. The refrigerant type (e.g. “R1234yf”) may also be

printed on the sealing caps.

♦ After connecting, carefully screw the handwheel of the service

coupling into the quick-release coupling adapter only to the

extent required to reliably open the valve -B, E- in the service

connection (observe the pressure gauge; do not open the

valve -B, E- too far).

♦ The service connections -C, F- for R134a and R134yf refrig‐

erant circuits are designed such that only the service couplings

specified for the corresponding refrigerant can be connected

(different dimensions ⇒ page 57 ).

♦ Service connections -C, F-, for example, are soldered into a

refrigerant line and therefore cannot be renewed separately.

♦ To remove and install the valves -B, E- (with the refrigerant

circuit drained), make use of an adapter from the socket -

T10364- for example.

♦ Take care when tightening the valves -B, E- (low torque).

♦ These valves are available in different versions with differing

tightening torques. Tightening torque for valve core -C-with a

VG5 thread (5.2 x 0.7 mm tyre valve): 0.4 Nm. +- 0.1 Nm;

tightening torque for valve core with an M6 x 0.75 mm thread:

0.9 Nm +- 0.1 Nm; tightening torque for valve core with an M8

x 1.0 mm: 2.0 Nm +- 0.2 Nm.

♦ There are different versions of valve caps -A, D-; therefore

tightening torques vary. Tightening torque for valve cap with

M8 x 1 mm or M10 x 1 mm thread: 0.4 Nm +- 0.1 Nm.

56

Rep. gr.87 - Air conditioning system

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General information on refrigerant circuit -> Connections for quick-release coupling in refrigerant circuit for Your Audi A2 SUV 1999-2005

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