Ensure that all contamination and foreign material has been removed from the refrigerant circuit. To this end, flush the system before installing the new compressor. Refrigerant R134a or a special flushing solution is suitable for flushing, depending on the contamination level. Compressors, dryers (accumulators), expansion valves, and throttle valves cannot be flushed. Since system contamination (abrasion, chips) must always be assumed in the case of a compressor defect and cannot be ruled out, it is absolutely essential that the system be flushed when replacing this component. Ensure that no residual flushing solution remains in the system. Dry the refrigerant circuit using nitrogen if necessary.
Replace the filter dryer or accumulator and the expansion valve or throttle valve (orifice tube).
As one and the same compressor can potentially be used for different vehicles or systems, the oil filling quantity and viscosity must be checked and/or corrected according to the manufacturer's specifications before installing the compressor. For this purpose, all the oil must be siphoned off and collected. The compressor must then be refilled with the entire oil quantity specified by the vehicle manufacturer (system oil quantity).
To ensure that the oil is distributed equally, the compressor must be turned 10x by hand before installation. When installing the drive belt it must be ensured that it is aligned. Some compressors are designed for so-called "multiple applications". This means that they can be installed in different vehicles. Except the number of grooves on the magnetic clutch, there is 100% agreement with the "used part".
After compressor installation and refilling of the refrigerant circuit, the engine should first be started and operated for several minutes at idling speed.
Further specifications (instruction leaflets, manufacturer's specifications, run-in specifications) are to be observed separately.