What Causes High Pressure in Car Air Conditioning?

[OmarLee]

Reasons for high pressure in car air conditioning: 1. Incomplete evacuation during maintenance, leading to air mixing into the system and increasing condensation pressure; 2. Use of inferior refrigerant, the condenser's electric fan cannot open normally or the wind speed is insufficient; 3. The condenser is blocked by foreign objects and cannot dissipate heat normally or the expansion valve is slightly clogged. Car air conditioning refers to the air conditioning device installed in the car, which can cool, heat, ventilate, and purify the air inside the compartment, providing a comfortable riding environment for passengers, reducing driver fatigue, and improving driving safety. The air conditioning system has become one of the indicators to measure whether a car is fully equipped with functions.

[Julia]

I recently encountered a similar issue, and there are quite a few reasons why a car's AC high pressure might be too high. The most common cause is a clogged condenser, especially in summer when dust buildup leads to poor heat dissipation and a spike in pressure. Another possibility is a non-functioning fan, which could be due to electrical issues or a faulty fan motor. Overcharging the system with too much refrigerant is also a dangerous factor that can cause excessive pressure. Prolonged high pressure can accelerate compressor wear and even lead to pipe bursts, which is quite alarming. I recommend first checking if the condenser is clean and verifying the fan's operation. If the problem persists, it's best to visit a professional shop for a pressure gauge test—don't attempt DIY fixes that might damage the AC system. Regular maintenance, like cleaning the condenser, can prevent many of these issues.

[SanIsla]

During my last long-distance trip, the high pressure in my car's air conditioning system was extremely high. The weather was muggy, and I suspect it was caused by poor heat dissipation. There was debris blocking the vents in front of the condenser, and the fan wasn't performing well, which kept the compressor pressure high. Excessive refrigerant could also cause abnormal pressure increases. In such cases, if left unaddressed, not only will the cooling effect be poor, but it will also shorten the compressor's lifespan. The lesson I learned is: regularly check if the fan is functioning properly and ensure good air circulation. Clean the condenser grille to prevent leaves or insect nests from accumulating. High pressure is no small matter—early detection and resolution can save you money.

[Marlene]

When the car's air conditioning high pressure is too high, it's usually related to heat dissipation. I've experienced this several times, mostly from driving in congested cities where the fan was broken or the condenser was dusty, preventing heat from dissipating and causing the pressure to spike. Overcharging the refrigerant can also cause issues. The solution is to simply check if the fan wiring is loose, and then rinse the condenser when washing the car. This can prevent further damage.

[StHarmony]

I think high AC high pressure mainly requires checking a few areas: a dirty condenser, a non-working fan, or excessive refrigerant. These can cause the system to overwork. I've DIY checked the fan rotation myself; using a multimeter to measure voltage can help identify the fault. But for more complex issues, it's safer to consult a technician—don't save money at the risk of damaging the car. When using the car, avoid running the AC for extended periods in high temperatures to reduce the cooling system's burden.