Refrigerant Circuit, Charging

Special tools and workshop equipment required 

• A/C Service Station

• Depending on the A/C Service Station used, changes to the work procedure may be needed. Pay attention to the Owner's Manual. Refer to Owner's Manual.
• Filling the refrigerant circuit must be done via the high pressure connection, the low pressure connection can normally stay connected. Refer to Owner's Manual.
• Make sure the A/C Service Station is on the same level as the vehicle whose refrigerant circuit is to be charged (maximum difference 50 cm) when charging the refrigerant circuit. If a difference in height is too large, a difference between the amount of refrigerant displayed on the service station and the actual amount filled in the circuit may result (depending on the version of the A/C Service Station). The precision of the A/C Service Station may be impaired by that.

Procedure 

-- Check if the new refrigerant oil in the reservoir is the correct oil type and change the oil in the reservoir if necessary.

-- Adjust the settings of the A/C Service Station that the refrigerant is filled through the high-pressure side. Refer to Owner's Manual.

Tip

• If on the A/C Service Station the filling direction cannot be set, then remove (close) the hand wheel on the quick-release coupling adapter on the low pressure side.

-- Refrigerant Circuit, Evacuating. Refer to REFRIGERANT CIRCUIT, EVACUATING .

-- Set the specified refrigerant capacities, refrigerant oil to be added and, if necessary, the UV additive at the A/C Service Station.

• Refrigerant. Refer to Technical Data .
• Refrigerant oil. Refer to Technical Data and COMPONENTS, REPLACING 
• UV additive. Refer to LEAKS, FINDING .

-- Start the procedure to charge the refrigerant circuit (refrigerant, if necessary refrigerant oil and UV additive) at the A/C Service Station.

-- After completion of the charging procedure A/C Service Station remove from the refrigerant circuit and turn it off. Refer to A/C SERVICE STATION, DISCONNECTING FROM THE REFRIGERANT CIRCUIT .

Vehicles with high-voltage system, for which electric activated valves in the refrigerant circuit are not open when de-energized.

-- Activate the electric activating valves of the refrigerant circuit using the Vehicle Diagnostic Tester .

Tip

For vehicles with high-voltage system and secondary functions of the A/C system, valves may be installed in the refrigerant circuit. To guarantee correct draining, evacuating and filling of the refrigerant circuit, no segments are allowed to be closed off. That is why the valves need to be closed after filling. Refer to Refrigerant Circuit .

Continuation for all vehicles

-- Depending on the completed work procedures, start the A/C system. Refer to A/C SYSTEM, OPERATING AFTER CHARGING .