What do you think of adding refrigerant in summer? Do you have time to add R 134a or just add it?

If a part of refrigerant in the automobile air-conditioning system leaks, and the refrigeration effect is not good, it needs to be replenished. Just add R 134a directly without vacuumizing, and add it to the low-pressure pipe pressure of 0. 15-0.25mpa. One thing to pay attention to is to evacuate the air in the connecting pipe. If you are worried about losing some refrigerant oil during the leakage of the original refrigerant, you can supplement some refrigerant oil at the same time. You can buy a filler to connect the refrigerant oil above the joint of the connecting pipe, or even directly inject it into the connecting pipe, and pay attention to the discharge of bubbles. The refrigeration oil should be a synthetic oil suitable for R 134a, not a mineral refrigeration oil of R 12 system in the last century.