What is the normal pressure range for car air conditioning?
3 Answers
Here is the relevant introduction to the normal pressure range for car air conditioning: 1. Car air conditioning refrigerant pressure: Under the condition of compressor speed at 1500—2000rpm, the high pressure should be around 1.5—2.0mpa, and the low pressure should be around 0.15—0.35mpa, which are considered normal values. 2. During normal operation: Generally, when the air conditioning system is running normally, the low pressure should be between 1.0—2.5bar, and the high pressure should be between 15—18bar. 3. Detecting the normal pressure range for car air conditioning: The high pressure should not exceed 1.7mpa and should not be lower than 1.3mpa; the normal range for low pressure is generally not lower than 1.15mpa and not higher than 1.25mpa, which is considered normal. If the low pressure is higher or lower than this normal range, it indicates that the expansion valve adjustment is abnormal.
Regarding the normal pressure values for car air conditioning, I believe there is a range for both high and low pressure. The low-pressure side is generally around 25 to 45 PSI, while the high-pressure side is approximately 150 to 250 PSI, but these are not fixed values and can vary with external temperature. For example, during hot summer days, the high pressure might slightly increase to 260 PSI, and in winter, it could be lower. When I perform routine checks, I use a simple pressure gauge tool, which is quite convenient for measuring the low-pressure port, and the tool only costs a few tens of dollars. The key point is that stable pressure indicates the refrigeration system is functioning properly with sufficient refrigerant. If the pressure is abnormal, it could indicate a refrigerant leak or compressor issue. It's recommended to have a professional inspection every six months to prevent a decline in air conditioning efficiency, which could affect driving comfort.
I usually handle AC issues myself, keeping the low-side pressure between 25-45 PSI and the high-side between 150-250 PSI. I bought a digital pressure gauge to connect to the car, then read the values after starting the AC at full load. Both too high or too low pressure are bad—excessive pressure may damage the pipes, while insufficient pressure leads to poor cooling performance. This is especially noticeable on hot days when temperatures exceed 35°C; it's normal for the high-side pressure to be higher, so don't panic. I think every car owner can keep a tool handy to try this—it's simple to operate and saves on repair costs. But remember, if the system shows abnormalities like the compressor stopping, take it directly to a mechanic.
