Information On The Mechanically Driven A/C Compressor

Depending on the time period of production and the engine, the compressor construction type may vary. Refer to the Parts Information.
Depending on the vehicle version, the vehicle date of manufacture and the engine, the A/C Compressor may be installed with or without the A/C Clutch -N25-.
The A/C compressor without an A/C Clutch -N25- is always driven when the engine is running. Since the version of the A/C Compressor (with or without the A/C Clutch -N25-) above is not always clearly distinguished, the engine may only be started when the refrigerant circuit has been properly assembled. If, for example, the refrigerant lines are not connected to the A/C compressor and the engine is started and runs, then the A/C compressor may be destroyed by the build-up of internal heat. Such internal warming results from the fact that - even with delivery near 0 % - the A/C compressor is confronted with a fixed resistance (sealed circuit).
To stop the A/C compressor being destroyed when the refrigerant circuit is empty, it is designed such that delivery is reduced to roughly 0 % and lubrication is maintained by way of an internal oil circuit with the oil left in the A/C compressor.
These A/C compressors are available as a replacement part with different oil capacities; therefore, note the oil quantity in the A/C compressor. Refer to TECHNICAL DATA .