After getting a diagnosis on the aircon leaking refrigerant, we were told to replace the rear evaporator and the lines leading to the evaporator from the front of the vehicle. This did not solve the problem. Now it seems that the front end evaporator has a leak and you can hear it hiss when running the aircon. I am looking to a mechanic who will attempt to do this work, as it is very complicated, requires removing the whole dashboard and several components just to access the evaporator.