What is the method to distinguish between high and low pressure pipes in car air conditioning?
2 Answers
The method to distinguish between high and low pressure pipes in car air conditioning is by observing the thickness of the pipes and comparing their temperatures. There are three maintenance methods as follows: 1. Clear debris from ventilation outlets: Ensure normal ventilation, check for any looseness in the outdoor unit frame, and remove any foreign objects inside the outdoor ventilation mesh cover, while keeping the ventilation outlets unobstructed; 2. Clean the surface of the heat exchanger: Improve the efficiency of the heat exchanger. When cleaning the indoor heat exchanger, carefully remove the panel and use a soft cloth to wipe it. Gently brush the heat exchanger of the indoor unit with a small brush to remove dust and harmful accumulations that can breed bacteria; 3. Clean dirt and deposits from the drainage part: The drainage part is prone to dirt accumulation and must be thoroughly disinfected regularly to ensure smooth drainage and prevent bacterial growth. Check the condition of consumable parts such as the air deflector, sterilization and dehumidification components, and photocatalyst to ensure the air conditioning system is in good condition without any abnormalities.
In our auto repair circle, we get familiar with this stuff over time. To distinguish between the high and low pressure pipes in a car's AC system, the key is temperature and touch. The high pressure pipe is thicker and feels warm when the AC is running, as it carries high-pressure, high-temperature refrigerant from the compressor. The low pressure pipe is thinner and feels cool, responsible for returning gas to the compressor. Their positions also differ—usually, the high pressure pipe is near the condenser at the front of the car, while the low pressure pipe runs toward the evaporator in the cabin. Try a few times, and you'll remember. During repairs, don’t mix them up—the high pressure pipe can burn you due to its heat, while the low pressure pipe’s normal temperature indicates whether the cooling system is functioning properly, saving you a lot of trouble.
