| The AC compressor sucks refrigerant gas from the evaporator, compresses it and transfers it to the condenser. |
| The AC compressor contains refrigerant oil, which can be mixed with the R134a refrigerant at all temperatures. |
| The name plate indicates which refrigerant is suitable for the AC compressor. |
| Different versions of compressors with various parameters are fitted according to the engine and vehicle type. |
| AC compressor with magnetic coupling: |
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| When the air conditioning system is switched on an electromagnetic coupling, which is mounted on the AC compressor, generates the shaft grip between the V-ribbed belt pulley and the AC compressor crankshaft. |
Note | So that the AC compressor suffers no damage when the refrigerant circuit is empty, the air conditioner magnetic coupling -N25- is switched off and the regulating valve for compressor of air conditioning system -N280- is no longer activated. |
| AC compressor without magnetic coupling: |
Note | Observe safety measures on vehicles with an AC compressor without magnetic coupling → Chapter. |
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| An overload protection mounted in the V-ribbed belt pulley of the AC compressor, is set to trigger when the AC compressor is difficult to move and protects the V-ribbed belt drive against overload. |
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| Externally controlled compressors with variable displacement of piston. The displacement of the compressor is controlled via an externally driven regulating valve with PWM signal on the suction side in accordance with the required cooling output. |
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| The compressor continues operating with a minimum power supply requirement even when the air conditioning system is off. |
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