Hello, I hope the topic fits in here. I have been driving a (new) car for 3 years with above-mentioned refrigerants. Now I was thinking about whether to have a climate maintenance. In the past they said every 2 years, which I see as a very short interval when the plant works smoothly. The dealer told me then, at R1234yf the shrinkage by diffusion is lower than at the old plants. Can anyone confirm that? How often do you leave the plant (please only for R1234yf antwor How much was missing? Basically, I wouldn’t mind having a look after three years, but the prices are really happy. Bosch, for example, wants 150 EUR plus 24 EUR per 100g of refrigerant for the service. What is your experience regarding maintenance prices and the loss of refrigerant. Are there any general signs that the system has too little refrigerant or where the signs are missing that there are not too few refrigerants in it? On my previous car, for example, the compressor was heard shouting when the refrigerant had dropped too far. Or when the system was switched on, a hissing noise on the expansion valve, as well as a hissing after the engine was switched off. Are the signs always occurring when there is too little refrigerant?