It can be seen from the above cases of tiguan car air conditioning maintenance: in the maintenance of this kind of air conditioning should be good at using its self-diagnosis function, with the shortest time to detect the fault, and the corresponding repair. In addition to the use of conventional methods to diagnose the fault, usually also need to use special instruments and equipment for self-diagnosis, inspection, do not use a replacement or guess the way to find fault, and should follow the correct inspection ideas, according to the maintenance information to accurately remove the fault point.