Thank you for your answers... It seems I should have lots of work to change that hose
About the compressor I put it on the bench and I engaged the clutch with 12 volts but I was not able to rotate it by hand, it seems stuck...so I suppose it is gone. I have a rebuilt one but it has not the clutch..could I use the old one? And about the freon.. R12 it's hard to find also here in Italy but what about the other hoses and other parts like evaporator? If I go 134 should I replace them too?