Attention! Start the car engine only when the air conditioner is completely filled with R134a refrigerant.
Pump out, evacuate and fill the air conditioner only at the service station, in accordance with the Operation Manual for the service unit.
In order to improve the conditions for separating the R134a refrigerant from the refrigerant oil, it is necessary to let the car engine run for several minutes at partial loads (at a frequency of 800–1200 min-1). This limits the escape of refrigerant oil when the refrigerant is recovered.
The recovered refrigerant oil must be replaced and re-introduced into the air conditioner through the service unit.
Substandard pumped oil should be sent for recycling.
If, at the end of the recovery process, the humidity indicator of the respective service unit shows too high a humidity level in the recovered R134a refrigerant, it must be dehumidified.
When evacuating from the air conditioner, atmospheric air, water vapor and other gases should be completely removed. This makes it possible to refill the system with R134a refrigerant. A decrease in the degree of vacuum indicates a leak in the refrigerant circuit.
Before filling with R134a refrigerant into the air conditioner, it is necessary to add refrigerant oil to the norm, instead of the one that came out during pumping.
In the case of replacing a part in an air conditioner, depending on its type, it is necessary to add refrigerant oil, even if no noticeable losses were detected during pumping. The filling capacity of the air conditioner is indicated on its plate located in the engine compartment under the hood.
Charging must be carried out in accordance with the Installation Instructions, while it is necessary to charge 440±10 g of R134a refrigerant. After refueling, it is necessary to plug the filling fittings of the air conditioner on the car.