What Causes High Pressure and High Low Pressure in Car Air Conditioning?
3 Answers
Car air conditioning high pressure is caused by: 1. Air entering the system due to incomplete vacuuming during maintenance, leading to increased condensing pressure; 2. Use of inferior refrigerant, the condenser electronic fan not opening properly or insufficient fan speed; 3. The condenser being blocked by foreign objects preventing normal heat dissipation or slight blockage of the expansion valve. Car air conditioning high low pressure is caused by: 1. Compressor damage; 2. Excessive opening of the expansion valve; 3. Poor system design, such as the compressor being too small, the expansion valve being too large, excessive flow resistance in the evaporator, or excessive flow resistance in the low-pressure pipe; 4. Poor heat dissipation of the condenser. Car air conditioning refers to the air conditioning device installed in a car, which can cool, heat, ventilate, and purify the air inside the compartment, providing a comfortable environment for passengers, reducing driver fatigue, and improving driving safety.
When I was driving, I encountered abnormal air conditioning pressure, with both high pressure and low pressure readings being elevated. This usually indicates an overcharged refrigerant causing system overload. When too much refrigerant is added, the condenser can't dissipate heat effectively, leading to increased pressure on both the high and low sides, which actually worsens cooling performance and increases fuel consumption. Common causes include inaccurate charging or overfilling after a refrigerant leak; high ambient temperatures can also contribute to this issue, and if the cooling fan is dirty or not functioning, it can exacerbate the problem. During my own inspection, I first used a pressure gauge to measure the readings, avoiding testing in extreme heat to prevent misdiagnosis. The solution is to release some refrigerant to bring it back to standard levels; if that doesn't work, cleaning the condenser surface or checking the fan circuit may be necessary. Don't underestimate this issue—prolonged high pressure can damage the compressor, leading to higher repair costs. It's advisable to consult a professional shop promptly.
As a car owner, my hands-on experience with DIY air conditioning repairs tells me that high pressure on both the high and low sides often indicates overcharging of refrigerant. Last time after replacing the refrigerant, the pressure skyrocketed and cold air wouldn't come out—I had to release some to achieve balance. If the condenser gets clogged with dirt or willow catkins, poor heat dissipation can also cause high pressure. In such cases, try rinsing it clean with water. For fan motor failures, it's best to call a professional since it involves electrical safety. I always make sure not to hastily recharge under scorching heat and measure the quantity precisely. While DIY can be fun, mistakes might cost more money than prevention. Regular checks of the AC system to maintain smooth heat dissipation are crucial and can even save some fuel costs.
