These questions are only for professionals in the field of air conditioning. I know that you can’t empty an air conditioning system for environmental reasons, but I have a purely question about it. As I know, the refrigerant in the compressor is still liquid and becomes gas-shaped in the condenser and runs as gas through the dryer. If you remove the dryer now, the gas will escape logically. Is the system completely empty of the refrigerant, or is it still in the liquid state? The car is a Saab 9-3 and in the whole system, according to literature, there are 150ml of compresor oil and if you change the dryer, you have to refill 30ml of oil, because this amount is lost by the exchange. Where do you fill in such an oil? Is there a filling hole on the compressor for this? Can you take any compressor oil, because for Saab I can’t find one directly.