Engine, Starting With Empty Refrigerant Circuit When Necessary
WARNING: This page is about a different variant/trim than selected.
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 and REFRIGERANT CIRCUIT, DISCHARGING .
- The A/C compressor is always driven when the engine is running; there is no A/C clutch. Therefore the engine may only be started when the 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.
- If possible, 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.
NOTE:
The A/C compressor has an "internal oil circuit" to ensure that the A/C compressor is not damaged when the 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 completely assembled.
- There must be no vacuum in the refrigerant circuit.
- The engine speed must not exceed 2500 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 amount must be in the A/C compressor.
NOTE:
If only the refrigerant was evacuated (the A/C compressor was not removed), it is guaranteed that there is enough refrigerant oil in the A/C compressor to continue lubricating the A/C compressor for a short operating period due to the design of the refrigerant circuit.