What Causes Both High and Low Pressure in Car Air Conditioning to Be Low?
3 Answers
When both the high and low pressure readings on a car air conditioning gauge are low, the possible causes are as follows: 1. Reasons for low high pressure in car air conditioning include: a. Insufficient refrigerant charge. b. Refrigerant leakage in the system. c. Possible blockage in the high-pressure pipeline before the expansion valve or the expansion valve opening being too small. 2. Reasons for low low pressure in car air conditioning include: a. Pipeline blockage causing insufficient low-pressure refrigerant flow. b. Expansion valve failure preventing it from opening. c. Insufficient refrigerant. Car air conditioning systems include refrigeration devices, heating devices, and ventilation devices. These integrated systems make full use of the limited space inside the car, featuring a simple structure and easy operation, making them the internationally popular modern car air conditioning system.
When I first encountered this issue, I was also puzzled. Dual low air conditioning pressure usually indicates insufficient refrigerant, which could be caused by leaks in the system or aging pipes leading to refrigerant leakage. When both high and low pressures are below normal values, the air blown by the AC isn't cold enough, significantly reducing its effectiveness. In daily maintenance, I've found common causes include damaged seals, loose compressor connections, or condenser issues. You should promptly visit a professional shop to test with a pressure gauge, confirm the leak, and then refill the refrigerant and carry out repairs. If the leak isn't fixed, the problem will recur after a while. During routine maintenance, check the condition of the AC pipes and connections—prevention is always more cost-effective than repairs. Don't forget safety first; a non-functioning AC affects driving comfort, and driving in hot weather can easily lead to fatigue.
Last time the car's AC wasn't cooling, so I curiously asked the mechanic about low pressure on both sides. He explained this usually indicates insufficient refrigerant, possibly due to leaks or natural depletion over time. When both high and low pressures are below standard, the AC system becomes inefficient, blowing warm air. Common failure points include compressor connection leaks, expansion valve blockages, or aging pipeline joints. He advised against DIY fixes and recommended taking it to a repair shop for inspection. The mechanic mentioned a simple check involves looking for oil stains at pipe connections - a telltale sign of leaks. When recharging refrigerant, ensure the system is clean to prevent contamination. On safety notes, AC malfunctions also affect defogging function, making rainy driving more hazardous.
