A/C Service Station, Connecting

A/C Service Station, Connecting

Vehicles with Connection on Low- and High-Pressure Side of Refrigerant Circuit
- Switch off ignition.
- Connect A/C service station to power supply.
- Connect quick-release coupling adapter to charging hoses of A/C service station (handwheels not screwed in/hand shut-off valve not open).
- Switch on A/C service station and evacuate charging hoses (only necessary if there is air in hoses).
- Switch off A/C service station.
- Unscrew caps from service connections (with valve).
- Connect A/C service station via service connections with quick-release coupling adapters to vehicle refrigerant circuit.
- Screw in handwheel of quick-release coupling adapters until valves are definitely open at refrigerant circuit connection (observe pressure gauge, do not strain valves).
- Perform planned tests and measurements.

Vehicles with no Connection on Low-Pressure Side of Refrigerant Circuit
On the following vehicles, no service connection is provided for the A/C service station on the low-pressure side of the refrigerant circuit. Adapters are required for connecting the A/C service station to the refrigerant circuit of these vehicles.
- Audi 80, Audi Cabrio, Audi Coupe
- Audi A4 up to 07.96
- Audi 100/ Audi A6 up to 03.97
- Audi A8 up to 11.97

NOTE:
- On vehicles with no or inaccessible connection at compressor, remove A/C Refrigerant Low Pressure Switch F73 (jumper contacts in connector for A/C Refrigerant Low Pressure Switch F73 ) and screw adapter to this connection.
- The tools listed below are commercially available or can be obtained from regional sales center/importer.
- Should it be necessary to measure pressures at switch connections on high-pressure side, make use of adapter from adapter set for refrigerant circuit V.A.G /9 and proceed in the same manner.







Connecting with Air Conditioning Adapter Set V.A.G 1786
A - Connection with valve (small valve insert) on low-pressure side of refrigerant circuit
B - Adapter with union nut V.A.G /1
C - Commercially available charging hose (short version with 5/8" thread on each end)
D - Adapter with service connection V.A.G /2 (for connection of quick-release coupling of A/C service station - E - )

NOTE:
- Assemble adapter and charging hose as shown and connect first to connection with valve - A -.
- Adapter with union nut V.A.G /1 is only to be used at connections with "small" valve insert (standard for connection with valve for A/C Refrigerant Low Pressure Switch F73 and also gradually introduced as of 10.94 at compressor).
- Instead of adapter with union nut V.A.G /1, use can also be made of adapter V.A.G /10 (remove valve from adapter V.A.G /10 or install valve opener in charging hose).

Connecting with Adapter VAG/10







- Unscrew cap from connection with valve - A - (at compressor).
- Attach O-ring - B - to connection (8.9 mm; 1.8 mm).
- Screw adapter V.A.G /10 - C - to connection - B -.
- Install valve opener - D - with appropriate seal in charging hose connection.

NOTE:
- The type of valve opener - D - and seals required depends on the charging hose used specific to manufacturer).
- The quick-release coupling adapter is not required for connection on the low-pressure side of Audi vehicles.
- Screw charging hose - E - (to A/C service station) to adapter V.A.G /10.







- To minimize the amount of air and moisture penetrating into the charging hoses and thus into the refrigerant circuit, the charging hoses should be connected together as illustrated.

A - Charging hose to A/C service station
B - Hand shut-off valve
C - Charging hose (short version) with valve opener for connection to adapter - D -
D - Adapter V.A.G /10
E - Charging hose (short version) with quick-release coupling adapter (for vehicles with quick-release coupling adapter on low-pressure side)

- Perform planned tests and measurements.