What to Do When the Car Air Conditioner Has High High Pressure and Low Low Pressure?

[BellaLynn]

It should be an issue with the compressor. Here is the relevant information: 1. Situation: Poor-quality compressors, even new ones, can exhibit such problems. If the compressor is confirmed to be functioning normally, touch the high-pressure pipe coming out of the compressor to check if it is hot. If it is very hot, it indicates a clogged condenser with poor heat dissipation. If it is not very hot, the issue still lies with the compressor. 2. Compressor maintenance: Check if the refrigerant is sufficient. The temperature difference between the inlet and outlet pipes of the dryer can be used to estimate, or a manifold pressure gauge can be used for detection. Regularly clean the air vents and dust and dirt inside the cabin. This not only helps maintain the car's appearance but is also beneficial for the health of the driver and passengers.

[JuliaLee]

I've fixed many car air conditioning issues, the most common being high pressure too high and low pressure too low, which is usually caused by overcharged refrigerant or a clogged expansion valve. Last time I encountered this, I measured the pressure and found it was high with a low pressure drop. After opening the hood, I discovered the condenser was covered in dust and had poor heat dissipation. Cleaning it improved the situation. If the expansion valve is clogged and refrigerant flow is obstructed, it can also cause this issue. Replacing the valve usually solves the problem. I recommend first using pressure gauges to check the high and low pressure values. If the high pressure exceeds 300 kPa or the low pressure is below 150 kPa, you should suspect either excessive refrigerant that needs adjustment or a faulty valve. If you can't handle it yourself, go to a repair station where professionals can save you time and effort. Remember, safety first - wear protective gear to avoid burns.

[DavidMarie]

From driving experience, when the high pressure of the air conditioning is high and the low pressure is low, it may be caused by expansion valve failure or uneven refrigerant circulation. I tested it several times with a gauge and found that the low pressure is too low, indicating restricted evaporator inlet, while the high pressure rises due to condenser blockage. Cleaning the condenser fins can alleviate heat dissipation issues. Additionally, excessive refrigerant, often caused by incorrect refilling, can be resolved by releasing some, but avoid tampering with the internal system—leave it to professional technicians to prevent compressor damage, which could lead to bigger problems. Check the wiring connections to avoid leaks and conduct a comprehensive inspection to ensure driving comfort.

[AlessandraLee]

The vehicle's air conditioning malfunctioned with high pressure on the high side and low pressure on the low side. I immediately realized the insufficient cooling was affecting driving safety—don't force it, pull over and stop. After checking the refrigerant status, if there's too much, it could be a recovery point or expansion valve issue. Replacing components can fix it. From personal experience, taking it to a repair shop is best—they have professional gauges for accurate testing, making it safe and worry-free. After all, AC systems are complex, and DIY attempts might risk damaging the car.