General Information
On the following vehicles, no service connection is provided for the service station on the low-pressure side of the refrigerant circuit; adapters must be used to connect the service station to the refrigerant circuit on these vehicles:
Note
On vehicles with no or inaccessible connection at compressor, remove A/C Refrigerant Low Pressure Switch -F73- (bridge terminals in connector to A/C Refrigerant Low Pressure Switch -F73-) and screw adapter to this connection. Refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87; System Overview - Refrigerant Circuit (vehicle-specific repair manual).
Note
Service Station, Connecting with A/C Adapter Set -VAG1786- to Refrigerant Circuit
A - Connection with valve (small valve insert) on low-pressure side of refrigerant circuit
B - A/C Adapter Set - Adapter 1 -VAG1786/1-.
C - Commercially available charging hose (short version with 5/8" thread on each end).
D - A/C Adapter Set - Adapter 2 -VAG1786/2- (for connection of quick-release coupling of service station -E-).
Note
Service Station, Connecting with A/C Adapter Set - Adapter -VAG1785- to Refrigerant Circuit
- Remove the cap from the connection with valve -A- (at A/C compressor).
- Attach the O-ring -B- to the connection (8.9 mm; 1.8 mm).
- Screw the adapter VAG1785/10 -C- onto the connection -B-.
- Install the valve opener -D- with the appropriate seal in the charging hose connection.
Note
Note
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 service station
B - Hand shut-off valve
C - Charging hose (short version) with valve opener for connection to adapter -D-
D - A/C Adapter Set - Adapter 10 - VAG1785/10-
E - Charging hose (short version) with quick-release coupling adapter (for vehicles with quick-release coupling adapter on low-pressure side).
- Perform the planned tests and measurements.
Servicing Station, Connecting for Measuring and Testing
- Turn off the ignition.
- Connect the service station to the power supply.
- Assemble adapter set and screw to connection on low-pressure side.
- Connect the quick-release coupling adapter to the charging hoses of service station (handwheels not screwed in/hand shut-off valve not open).
- Switch on the service station and evacuate the charging hoses (only necessary if there is air in charging hoses).
- Switch off the service station.
- Remove the cap from the service connection/connection with valve (or remove low-pressure switch and bridge respective electrical connections).
- Connect the service station via the service connections with the quick-release coupling adapters to the vehicle refrigerant circuit.
- Install the handwheel on the quick-release coupling adapters only until valve is definitely open at refrigerant circuit connection (observe pressure gauge, do not strain valve).
- Perform the planned tests and measurements.