Engine, Starting With Empty Refrigerant Circuit When Necessary
Installed on Vehicles with High Voltage Systems (Hybrid Vehicles)
For all procedures on vehicles with a high-voltage system, pay attention to the additional warnings for these vehicles. Refer to SAFETY PRECAUTIONS WHEN WORKING ON VEHICLES WITH HIGH-VOLTAGE SYSTEM .
- After the installation of the electrically-driven A/C compressor and the subsequent filling of the refrigerant circuit, start the A/C compressor for the first time using the "compressor intake" function for the basic setting. The A/C compressor may otherwise become damaged if refrigerant oil was improperly stored in the A/C compressor compression chamber before installation. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" Function (A/C System).
- Only activate the electrically driven A/C compressor when the refrigerant circuits are 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 (A/C System).
- All removed parts are installed once again.
- So that the A/C compressor is not damaged by an empty refrigerant circuit, the Electrical A/C Compressor -V470- is not activated by the control head the Climatronic Control Module -J255-. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
If the A/C compressor is removed or removed from the engine after filling the refrigerant circuit, operate the Electrical A/C Compressor -V470- via the "compressor cut-in" function. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
The A/C compressor may otherwise become damaged if before installation (or after removal), refrigerant oil was improperly stored (or secured) in the A/C compressor compression chamber.
Read the information for starting the A/C system after filling. Refer to A/C SYSTEM, GENERAL INFORMATION or A/C SYSTEM, OPERATING AFTER CHARGING . After recharging, before activating the A/C system.
For Vehicles without a High Voltage System
There is a risk of damaging the A/C compressor if the engine runs when the refrigerant circuit is not filled. Refer to REFRIGERANT CIRCUIT, DISCHARGING .
- The A/C compressor is always driven when engine is running; there is no magnetic clutch. Engine is therefore not to be started unless refrigerant circuit has been properly assembled.
- For example; if the refrigerant lines are not connected to A/C compressor, the A/C compressor may heat up so much when the engine is running that the A/C compressor will be damaged by internal heat generation.
- Only start the engine when the refrigerant circuit is filled.
- Do not start the engine while evacuating the refrigerant circuit or when the refrigerant circuit is evacuated. Refer to Refrigerant Circuit (Refrigerant R134a Servicing, Refrigerant Circuit, Working with A/C Service Station) or REFRIGERANT CIRCUIT, EVACUATING .
- The engine should not be run for longer than absolutely necessary.
The A/C compressor has an "Internal oil circuit" to ensure the A/C compressor is not damaged when refrigerant circuit is empty. There must be a residual amount of refrigerant oil in the A/C compressor for this.
- The refrigerant circuit must be fully assembled.
- There must be no vacuum in the refrigerant circuit.
- The engine speed must not exceed 2, 500 rpm.
- The engine should not be run for longer than absolutely necessary (for example, to move the vehicle into the workshop area).
- If the A/C compressor was removed: At least a quarter of the prescribed refrigerant oil must be in the A/C compressor.
If only the refrigerant was extracted (the A/C compressor was not removed), it is assured that there is enough refrigerant oil is in the A/C compressor to maintain the lubrication of the A/C compressor for a short operating period due to the design of the refrigerant circuit.