What is the normal pressure for car air conditioning pressure testing?

[DiStephen]

Car air conditioning pressure testing should reach around 20-30 bar. Extended knowledge: Tips for using car air conditioning: 1. How to determine air conditioning leaks: Nitrogen pressure is generally used for pressure testing and leak detection in car air conditioning systems. If the air conditioning pressure can stabilize at 20-30 Bar, it indicates that the air conditioning leak issue has been resolved, and the car air conditioning system has good sealing performance. Only then can the air conditioning vacuuming and refrigerant charging proceed. 2. Air conditioning maintenance: After using the air conditioning for a period of time, check the refrigerant and air conditioning filter. If the refrigerant is low, it needs to be replenished; if the air conditioning filter is too dirty, it needs to be replaced. Also, check the vehicle's radiator for any foreign objects and pay attention to air conditioning cleaning, as bacteria may develop. When cleaning, ensure thorough cleaning of the condenser and radiator.

[Gage]

I usually enjoy checking my car's air conditioning system myself. During a pressure test, the normal pressure should be maintained between 220 to 250 psi, depending on the AC system and ambient temperature. A reading that's too high might indicate system blockage or compressor failure, while too low could mean Freon leakage leading to poor cooling. I remember one summer when my car's AC suddenly stopped cooling. I tested it with a pressure gauge and found the pressure was only 180 psi. After locating and fixing the leak point, it returned to normal. I recommend checking it during spring maintenance to avoid turning your car into an oven during hot days, saving both money and hassle. Additionally, here's a simple procedure for the pressure test: connect the high and low-pressure gauges, start the engine, turn the AC to maximum fan speed, and observe the pressure changes. Remember not to exceed 250 psi to avoid damaging components—safe driving is always important.