What is the pressure of a car air conditioner in kilograms?
2 Answers
Under normal operating conditions of the air conditioning system, the low pressure is generally between 1.0—2.5 bar, and the high pressure is between 15—18 bar. Below is a detailed introduction to the car air conditioner pressure values: 1. The normal range for detecting car air conditioner pressure is generally that the high pressure should not exceed 1.7 MPa and should not be lower than 1.3 MPa. 2. The normal range for low pressure is generally not lower than 1.15 MPa and not higher than 1.25 MPa, 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. 3. The air conditioning gauge usually has two dials: a blue one for low pressure and a red one for high pressure. If the ambient temperature is higher, the pressure should be higher; if the ambient temperature is lower, the low pressure should also be appropriately lower.
I've seen quite a few car air conditioning pressure issues. Normally, the pressure gauge shows about 1.5 to 3 kg/cm² on the low-pressure side and 14 to 17 kg/cm² on the high-pressure side, depending on the weather temperature. For example, the pressure might be slightly higher during hot summer days and lower in cold winter—never tamper with the gauges yourself. Before measuring, make sure the engine speed is stable at around 1500 RPM, otherwise, the readings won’t be accurate. If the pressure is abnormally low, it might indicate a refrigerant leak; if it’s too high, there could be a blockage in the lines or a compressor malfunction. For such issues, it’s best to visit a professional shop for instrument diagnostics—they can accurately pinpoint the cause and handle it safely, as improper pressure can damage components or affect cooling performance. Remember to have technicians check the AC system during every maintenance to prevent minor issues from escalating.
