What should I do if the valve core of automobile air conditioner leaks?

The following are the ways to solve the air leakage of automobile valve core: 1. There is carbon deposit or burning loss between the valve and the valve seat: the elimination method is to remove carbon deposit and grind it. If it is heavy, it is necessary to grind the valve, and then grind it after repairing the valve seat. 2. Incorrect clearance between valve and valve guide: When the clearance is too large, the valve will swing and close, resulting in poor sealing; The gap is too small, and the valve is stuck in the conduit, resulting in the valve not being closed tightly or unable to be closed. In this case, we should find out the reason why the clearance is too large or too small, and replace the conduit or valve that affects the normal fit clearance. 3. The valve spring is not elastic enough or broken: the valve cannot be closed or closed tightly. The elimination method is to replace the valve spring; The valve stem and other parts are not closed tightly because there is no room for expansion after heating. Adjust the valve lash as needed.