What Causes Normal High Pressure but Low Low Pressure in Car Air Conditioning?

[MacJack]

Car air conditioning exhibits normal high pressure but low low pressure due to: 1. Insufficient refrigerant; 2. Blocked air conditioning pipelines; 3. Malfunctioning expansion valve failing to open. When the air conditioning compressor operates between 1500 to 2000 rpm, the car air conditioning's high pressure should be between 1.5 to 2.0 MPa, and the low pressure between 0.15 to 0.35 MPa. In high ambient temperatures around the vehicle, the high pressure may rise to 2.5 to 2.8 MPa but should not exceed 3.1 MPa, as surpassing this limit will trigger the pressure protection switch. Methods for using and maintaining car air conditioning include: 1. Avoid setting the temperature too low; 2. Adjust the direction of the air vents; 3. Do not keep it running for too long; 4. Appropriately increase the air volume; 5. Turn off the air conditioning when driving at low speeds; 6. Avoid immediate heavy use of air conditioning after prolonged exposure to intense sunlight.