Why Does the High-Pressure Gauge Needle of a Car Air Conditioner Swing Back and Forth?

[CamillaRose]

Here are the reasons and solutions for the back-and-forth swinging of the high-pressure gauge needle in a car air conditioner: Safety Valve Leakage: This usually occurs when the system pressure is too high, causing the car's safety valve to leak. In this case, the system pressure can be reduced through physical methods. Safety Valve Closure Issue: The safety valve may not be fully closed. It is necessary to check whether the safety valve is closed, and if not, close it properly. Water Quality Issue: Leakage caused by dirty, clogged, or damaged water quality. In this situation, try replacing the water used and observe whether the issue persists.