A/C System, Operating After Charging

A/C System, Operating with Mechanically Driven A/C Compressor

-- Switch the ignition on.

-- Adjust the A/C system to the lowest possible output (for example select "A/C off" mode).

-- Switch off the A/C compressor activation (for example select "A/C off" mode).

-- Start the engine with the A/C compressor switched off (for example select "A/C off" mode).

-- Wait until idle speed has stabilized.

-- Switch on the A/C compressor and operate the system for at least two minutes at idle speed.

-- If necessary, check pressures in the refrigerant circuit using the A/C Service Station. Refer to WORKING WITH A/C SERVICE STATION .

-- Turn off the engine.

-- Disconnect the A/C Service Station from the refrigerant circuit and turn it off. Refer to A/C SERVICE STATION, SWITCHING OFF AND DISCONNECTING FROM REFRIGERANT CIRCUIT .

A/C System, Operating with Electrically Driven A/C Compressor

-- Switch the ignition on.

-- Operate the A/C compressor using "basic setting, compressor cut-in" in Guided Fault Finding. Refer to Vehicle Diagnostic Tester , "Guided Fault Finding" function in A/C system and battery regulation.

Additionally on vehicles with electric operated valves in the refrigerant circuit, which cannot be opened without power:

-- The Vehicle Diagnostic Tester enables the activation of the electrically activated valves (not open without current) for A/C system operation via the respective control module (to open or close). Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

All A/C systems with electrically-driven A/C compressor

-- After the basic setting and if necessary, check pressures in refrigerant circuit using A/C Service Station.

-- On vehicles with a high-voltage system, switch off (deactivate) the "auxiliary climate control" function. Refer to the Owner's Manual and Infotainment/MMI Operating Manual.

-- Switch off the ignition.

-- Disconnect the A/C Service Station from the refrigerant circuit and turn it off. Refer to A/C SERVICE STATION, SWITCHING OFF AND DISCONNECTING FROM REFRIGERANT CIRCUIT .

Vehicles with an electrically-driven A/C compressor

• The engine may only be started if the refrigerant circuit is completely assembled.
• Hybrid drive on vehicles with battery cooling is only possible with a fully charged A/C system in which there are no stored errors. Refer to the Vehicle Diagnostic Tester in the "Guided Fault Finding" function for the A/C system and the battery regulation.
• After the installing the electrically-driven A/C compressor and the subsequent charging the refrigerant circuit, first start the A/C compressor using the "compressor cut-in" function of the basic setting. If refrigerant oil has accumulated in the A/C compressor compression chamber before installation due to improper storage, this could cause damage to the A/C compressor. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function for A/C System and Battery Regulation.
• Only activate the electrically-driven A/C compressor when the refrigerant circuit is filled. The A/C compressor may become damaged if the A/C compressor is run while the refrigerant circuit is empty. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function for A/C system and battery regulation.

-- Charge the vehicle batteries, for example, using the Battery Charger:VAS 5904  in battery support mode to minimize the number of automatic engine starts during the testing and measuring procedures while ready mode is active. Refer to Battery, Charging and SAFETY PRECAUTIONS WHEN WORKING ON VEHICLES WITH HIGH-VOLTAGE SYSTEM .

-- For testing and measurement procedures that require the ready mode to be active or the ignition to be switched on, the selector lever must be in the "P" position and the parking brake must be activated. The required tools must be placed so that they do not come into contact with any rotating components in the engine and they must also not go into the vicinity of the rotating components when the engine is running.