Where can I refuel the car air conditioner compressor?

Automobile air-conditioning compressors are usually filled with refrigeration oil before leaving the factory. The place is the oil plug, usually the front cover, and there is a piston bolt, similar to the bolt of the automobile oil pan. The best filling effect starts from here. If you want to add oil at ordinary times, the best way is to remove the pressure plate at the suction port, introduce the refrigeration oil you need to add, then install the pressure plate at the suction port, and then the compressor will directly circulate to the core mechanism through the suction port.