A/C System, Operating After Filling Refrigerant Circuit
A/C System, Operating After Filling Refrigerant Circuit
• Start engine only after refrigerant circuit has been assembled.
• If possible start engine only with a filled refrigerant circuit.
• Do not start the engine while evacuating the refrigerant circuit or when the circuit is already evacuated (the A/C compressor could be damaged).
• The A/C compressor is always driven by the belt pulley (there is no magnetic clutch). To prevent damage when the compressor is idling, it is lubricated by an internal oil circuit.
• The compressor has an internal oil circuit to ensure the A/C compressor is not damaged when refrigerant circuit is empty. The prerequisite for the internal lubrication is residual refrigerant oil in the A/C compressor and no vacuum in the refrigerant circuit.
• The engine may only be started when the refrigerant circuit is installed correctly. For example; if the refrigerant lines are not connected to A/C compressor, when the engine is running the A/C compressor may heat up (via internal heat generation) so much that the A/C compressor will be damaged.
• A/C Compressor Regulator Valve (N280) is not activated when the refrigerant circuit is empty and the A/C compressor idles with the engine. As there is no refrigerant in the circuit the oil required to lubricate is not fed to the A/C compressor.
• All removed parts are installed once again.
• The refrigerant circuit is filled.
If it is necessary to start the engine with a discharged refrigerant circuit
• Refrigerant circuit must be fully assembled.
• There must be no vacuum in the refrigerant circuit.
• At least 1/4 of the prescribed refrigerant oil must be in the A/C compressor.
• No not rev engine higher than 2500 rpm.
• The engine should only run as long as is absolutely necessary.
Note the following when starting engine for first time after filling refrigerant circuit
- Allow the engine to idle for at least 5 minutes with the A/C compressor switched off.
• The indicator lamp in the AC button - 9 - does not illuminate.
- Open all instrument panel vents, the vents in the center console and the vents in the B-pillar if present.
- Switch the A/C compressor on by selecting the "Auto" mode on the Climatronic control module (J255) (and on the Rear A/C display control head (E265) if present) (the indicator lamps in the AUTO buttons and the AC button illuminate).
• The indicator lamp in the buttons - 2, 4, 9 - illuminates.
• The indicator lamp in the buttons - 3, 6 - illuminates.
• By pressing the SYNC button - 10 - on the Climatronic control module (only in the comfort version), the settings for the front driver side are applied to the front passenger side and also on the Rear A/C display control head.
- Via the rotary switches of the Climatronic control module, the temperature preselection is set to cold (for the driver and front passenger side).
- In vehicles with a Rear A/C display control head, also set the temperature preselection for the rear to cold (for the left and right side).
• By previously pressing the SYNC button, the settings for the front driver side are applied to the front passenger side and also on the Rear A/C display control head if present.
- Allow the A/C compressor to idle for at least 5 minutes.
• Note the information regarding operating the A/C system after filling.