Get Connecting air conditioner service station -> Connecting air conditioner service station - vehicles with no connection on the low-pressure side of the 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

All vehicles

– Perform planned tests and measurements.

7.2

Connecting air conditioner service sta‐

tion - vehicles with no connection on the

low-pressure side of the refrigerant cir‐

cuit

On the following vehicles, no service connection is provided for

the air conditioner service station on the low-pressure side of the

refrigerant circuit. Adapters are required for connecting the air

conditioner service station to the refrigerant circuit of these vehi‐

cles.

♦ Audi 80, Audi Cabriolet, Audi Coupé

♦ Audi A4 up to 07/96

♦ Audi 100 / Audi A6 up to 03/97

♦ Audi A8 up to 11/97

Note

On vehicles without a connection or with an inaccessible connec‐

tion at the air conditioner compressor, remove the low pressure

switch for air conditioning system - F73- (bridge contacts in con‐

nector for low pressure switch for air conditioning system - F73- )

and screw adapter onto this connection ⇒ Heating, air condition‐

ing; Rep. gr. 87 ; Refrigerant circuit (vehicle-specific Workshop

Manual).

Note

♦ The tools listed below are commercially available or can be

obtained from the regional sales centre or importer.

♦ Should it be necessary to measure pressures at switch con‐

nections on high-pressure side, use adapter from adapter set

for refrigerant circuit - V.A.G 1785/9- and proceed in the same

manner.

190

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

⇒ “7.2.1 Connecting air conditioner service station to refrigerant

circuit with adapter set for refrigerant circuit V.A.G 1786 ”,

page 191

⇒ “7.2.2 Connecting air conditioner service station to refrigerant

circuit with adapter V.A.G 1785/10”, page 191

⇒ “7.2.3 Connecting air conditioner service station for measuring

and testing”, page 192

7.2.1

Connecting air conditioner service sta‐

tion to refrigerant circuit with adapter set

for refrigerant circuit - V.A.G 1786-

A - Connection with valve (small valve core) at low-pressure side

of refrigerant circuit

B - Adapter with union nut - V.A.G 1786/1-

C - Commercially available filler hose (short version with 5/8"

thread on each end)

D - Adapter with service connection - V.A.G 1786/2- (for connec‐

tion of quick-release coupling of air conditioner service station

-E-)

Note

♦ Assemble adapter and filler hose as shown and start by con‐

necting to connection with valve -A-.

♦ The adapter with union nut - V.A.G 1786/1- is only to be used

at connections with a “small” valve core (standard for connec‐

tion with valve for low-pressure switch for air conditioning

system - F73- and also gradually introduced as of 10.94 at the

air conditioner compressor).

♦ Instead of adapter with union nut - V.A.G 1786/1- , you can

also use adapter - V.A.G 1785/10- (remove valve from adapter

- V.A.G 1785/10- or install valve opener in filler hose).

7.2.2

Connecting air conditioner service sta‐

tion to refrigerant circuit with adapter

V.A.G 1785/10

– Unscrew the sealing cap from the connection with valve -A-

(at the air conditioner compressor).

– Attach O-ring -B- to connection (8.9 mm; 1.8 mm).

– Screw adapter V.A.G 1785/10 -C- onto connection -B-.

– Install valve opener -D- with appropriate seal in filler hose

connection.

Note

♦ The type of valve opener -D- and seals required depends on

the filler hose used (specific to manufacturer).

♦ The quick-release coupling adapter is not required for con‐

nection on the low-pressure side of Audi vehicles.

♦ Screw filler hose -E- (to air conditioner service station) onto

adapter - V.A.G 1785/10- .

7. Connecting air conditioner service station

191

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

Air conditioner with refrigerant R134a - Edition 11.2018

Note

To minimise the amount of air and moisture entering the filler ho‐

ses and thus into the refrigerant circuit, the filler hoses should be

connected as illustrated.

A - Filler hose to air conditioner service station

B - Hand shut-off valve

C - Filler hose (short version) with valve opener for connection to

adapter -D-

D - Adapter - V.A.G 1785/10-

E - Filler hose (short version) with quick-release coupling adapter

(for vehicles with quick-release coupling adapter on low-pressure

side)

– Perform planned tests and measurements.

7.2.3

Connecting air conditioner service sta‐

tion for measuring and testing

– On vehicles with high-voltage system, switch off (deactivate)

auxiliary air conditioner function ⇒ Owner's Manual and ⇒

Infotainment/MMI Operating Manual .

– Switch off ignition.

– Connect air conditioner service station to power supply.

– Assemble adapter set and screw onto connection on low-

pressure side.

– Connect quick-release coupling adapter to filler hoses of air

conditioner service station (handwheels not screwed in/hand

shut-off valve not open).

– Switch on air conditioner service station and evacuate filler

hoses (only necessary if there is air in the filler hoses).

– Switch off air conditioner service station.

– Unscrew the sealing cap from the service connection or the

connection with valve (or remove the low-pressure switch and

jumper the corresponding electrical connections).

– Connect air conditioner service station to vehicle refrigerant

circuit via service connections with quick-release coupling

adapters.

– Only screw in the handwheel of the quick-release coupling

adapters to the extent required to reliably open the valve at the

refrigerant circuit connection (observe pressure gauge, do not

open valve too far).

– Perform planned tests and measurements.

192

Rep. gr.87 - Air conditioning system

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