Hello! Since the air conditioning system for a vehicle has not worked for a long time, an air conditioning maintenance was carried out in a workshop. The workshop had to suck the refrigerant off immediately, because a filling valve is probably defective. At home I also found out with a UV lamp that at the front of the capacitor a little (not much) contrast agent can be seen. Therefore I want to renew the filling valve and the capacitor. It is for me the first time, since ss I am working on an air conditioner. It is emptied as written. I have already built out the filling valve and made the cap on the closure of the line. Do I have to pay attention to something special? Is it necessary to lubricate seals with air conditioner oil beforehand? Is there anything else? I have read somewhere that nothing should contaminate the system. Should I possibly also prophylactically renew any seals that like to break? And, the important If I have installed the air condensator, how long should you take maximum time to fill the system? I remember that the dryer pulls moisture. Are 2.3 days of distance too much? Thank you in advance for your answers.