How to Measure Car Air Conditioning Pressure?
1 Answers
To check car air conditioning refrigeration system faults with a pressure gauge, it is generally divided into two states: compressor stopped and running. After the compressor has been stopped for more than 10 hours, the high and low pressures of the compressor should be the same value. If the displayed values of high and low pressures are not equal, it indicates a blockage inside the system, and the expansion valve, liquid storage bottle, and pipeline should be inspected. Here are the relevant details: When the compressor is running, control the engine speed at 1500-2000r/min, start the air conditioning to make the compressor work. Generally, the low-pressure side pressure is about 150-250kpa, and the high-pressure side pressure is about 1400-1600kpa. If the pressure indication does not match the normal value, fault diagnosis can be performed as follows. 1. Both high and low-pressure gauges indicate values lower than normal. This may be due to insufficient refrigerant. During inspection, the high-pressure pipe may be slightly warm, and the low-pressure pipe slightly cold, but the temperature difference is not significant. Bubbles can be observed in the sight glass every 1-2 seconds. At this time, check for any leakage points, repair the leak, and then replenish the refrigerant. 2. The low-pressure gauge shows a value much lower than normal. At this time, a blurry mist flow can be seen in the sight glass, there is no temperature difference between high and low pressures, and the air conditioning is not cold, indicating a severe refrigerant leak.
