Most cars have observation holes in the air conditioning pipes

Refrigerant is the basic guarantee for the normal operation of automobile air conditioning system. It is not good to have more or less refrigerant. General repair shops will determine the amount of refrigerant by detecting the pressure of the air conditioning system. In fact, most vehicles have a transparent observation hole on the air conditioning pipeline, which allows us to easily check the refrigerant margin without any auxiliary tools.

If a few bubbles occasionally flow through the observation hole, it means that the amount of refrigerant is normal. If there are a lot of bubbles in the observation hole, the refrigerant is insufficient. If you can hardly see any bubbles in the observation hole, there are two possibilities, one is that the refrigerant is excessive, and the other is that the refrigerant is almost leaking. If the air conditioner can still be cooled at this time, but the cooling effect is not good, it is basically an excess of refrigerant. If the air conditioner is hardly refrigerated after it is turned on, the refrigerant is completely gone.