What is the normal operating pressure of a car air conditioner?
2 Answers
Car air conditioning operating pressure is divided into two situations: high pressure and low pressure. The normal pressures are as follows: 1. The normal high pressure of a car air conditioner should be 1.3-1.7MPa (13-17kg/cm2 or 190-250Lbf/in2). 2. The normal low pressure should be between 0.15-0.25MPa (1.5-2.5kg/cm2 or 20-35Lbf/in2). Here is some introduction about the car air conditioning system: (1) The car air conditioning system is a device that cools, heats, ventilates, and purifies the air inside the car. (2) The car air conditioning system can provide a comfortable riding environment for passengers, reduce driver fatigue, and improve driving safety. (3) The air conditioning system has become one of the indicators to measure whether a car is fully equipped.
I've been repairing car air conditioning systems for many years. The normal operating pressure range for a car AC is 25 to 45 psi on the low-pressure side and around 150 to 250 psi on the high-pressure side, but these values can vary with ambient temperature. During hot summer days, the high pressure might approach 250 psi, with low pressure around 35 psi; in winter, the pressures tend to be slightly lower. When I check with pressure gauges, I find that both excessively high and low pressures are dangerous—high pressure risks pipe bursts, while low pressure indicates insufficient refrigerant or blockages, leading to poor cooling performance. I recommend professional maintenance every two years. After adding refrigerant, the pressure stabilizes, preventing sudden failures while driving. I always emphasize that people shouldn't tamper with it themselves, as electrical components pose shock risks. Remember, temperature has a significant impact—high temperatures mean high pressure, low temperatures mean low pressure. The safest approach is to have a reliable technician perform an instrument check.
