A/C Refrigerant System, Servicing

A/C Refrigerant System, Servicing

NOTE:
- The refrigerant in the refrigerant circuit is never to be topped up (drain, evacuate and refill circuit) Refrigerant R134a - Servicing.
- The compressor is always driven when the engine is running; there is no A/C clutch. The engine is therefore not to be started unless the refrigerant circuit has been properly assembled. If, for example, the refrigerant lines have not been connected to the compressor, heat generation inside the compressor with the engine running may lead to destruction of the compressor. Internal heating is caused by the compressor operating even at almost 0% delivery rate in opposition to a fixed resistance (sealed circuit).
- To stop the 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 compressor.
- Replacement compressors contain the full quantity of refrigerant oil required for the refrigerant circuit Refrigerant R134a Servicing.
- Different refrigerant oils are specified for "Zexel", "Sanden" and "Denso" compressors Refrigerant R134a - Servicing.
- The specified O-ring diameters and the tightening torques also apply to bolted joints of refrigerant lines/hoses between the individual components.
- Only fit O-rings approved for refrigerant R134a Refrigerant R134a - Servicing.
- Checking cooling output
- Checking pressures in refrigerant circuit Refrigerant R134a - Servicing
- For all other servicing and testing work, refer to Refrigerant R134a - Servicing.