What Causes Both High and Low Pressure in Car Air Conditioning to Be Low?

[OKimberly]

Reason: Insufficient refrigerant or leakage. Solution: Use a leak detector to locate the leak, repair it, and refill the refrigerant. Below are the relevant details: 1. Manifold Gauge Measurement: During the operation of the refrigeration system, internal pressure changes follow certain patterns, so a manifold gauge can be used to measure the pressure in the high and low-pressure lines. Based on the pressure changes, potential causes and locations of system faults can be diagnosed. 2. Normal Working Pressure: Under normal conditions, when the compressor operates at 1500-2000 rpm, the high pressure should be around 1.5-2.0 MPa, while the low pressure should be around 0.15-0.35 MPa. If the ambient temperature around the vehicle is high, the high pressure may reach around 2.5-2.8 MPa, but it generally should not exceed 3.1 MPa, otherwise, pressure protection will be triggered.