Engine, Starting With Empty Refrigerant Circuit When Necessary

WARNING: This page is about a different variant/trim than selected.

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 .

CAUTION:

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.

NOTE:

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, OPERATING AFTER CHARGING [R134a] or A/C SYSTEM, OPERATING AFTER CHARGING [R1234yf] . After recharging, before activating the A/C system.

For Vehicles Without A High Voltage System

CAUTION:

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 (R1234yf) .

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, DISCHARGING WITH A/C SERVICE STATION (R134a) / REFRIGERANT CIRCUIT, EVACUATING WITH A/C SERVICE STATION (R134a) / REFRIGERANT CIRCUIT, CHARGING WITH A/C SERVICE STATION (R134a) (Refrigerant R134a Servicing, Refrigerant Circuit, Working with A/C Service Station) or REFRIGERANT CIRCUIT, DISCHARGING (R1234yf) / REFRIGERANT CIRCUIT, EVACUATING (R1234yf) / REFRIGERANT CIRCUIT, CHARGING (R1234yf) .
The engine should not be run for longer than absolutely necessary.

NOTE:

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.

NOTE:

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.