What do H and L on car air conditioning pipes mean?

[MacGavin]

H and L on car air conditioning pipes refer to the distinction between the high-pressure pipe and the low-pressure pipe of the air conditioning system. H stands for the high-pressure pipe interface, while L stands for the low-pressure pipe interface. These interfaces on car air conditioning pipes are used to distinguish the pipes during air conditioning maintenance. Normally, they are tightly screwed to prevent dust from entering or adhering. The functions of the car air conditioning system include: 1. Controlling the temperature inside the car to provide a comfortable environment for drivers and passengers; 2. Drawing in fresh air for ventilation; 3. Removing moisture from the car to achieve air circulation between the inside and outside of the vehicle; 4. Filtering dust and impurities from the air to purify the car's interior environment.