What is the pressure of car air conditioning pipes?
2 Answers
Car air conditioning low-pressure pipe pressure is between 1.0 to 2.5 bar; high-pressure pipe pressure is between 15 to 18 bar. More information about car air conditioning is as follows: 1. The normal low pressure of car air conditioning should be between 0.15 to 0.25 MPa; normal high pressure should be between 1.3 to 1.7 MPa. 2. The car air conditioning system is a device that cools, heats, ventilates, and purifies the air inside the vehicle compartment. 3. It can provide a comfortable riding environment for passengers, reduce driver fatigue, and improve driving safety. 4. The air conditioning system has become one of the indicators to measure whether a car is fully equipped with functions.
I've driven various car models, and the pressure changes in the AC lines can vary significantly. Under normal conditions, the high-pressure side is around 200 psi, while the low-pressure side is about 30 psi. However, on hot days, it can surge to nearly 300 psi, and drop back down in cold weather. When the system operates normally, the pressure balances out—the high pressure rises quickly when the compressor kicks in and gradually drops when it shuts off. There are many influencing factors, primarily ambient temperature—high temperatures in summer cause a sharp spike in pressure, increasing compressor load and the risk of issues, while winter brings more stable pressures. Vehicle type also plays a role, with SUVs having 10-20% higher pressure than sedans due to engine output affecting the load. Refrigerant type matters too—older R134a systems operate at 25-50 psi low pressure and 150-280 psi high pressure, while newer R1234yf systems run slightly higher pressures for better environmental friendliness. Remember, never attempt to check the pressure yourself with gauges—the high-pressure lines can cause severe burns. I've seen leak accidents at repair shops—it's too dangerous. Professional advice: schedule regular AC maintenance to prevent refrigerant leaks or compressor failures.
