What Causes Excessive High Pressure in Car Air Conditioning?
2 Answers
The reasons for excessive high pressure in car air conditioning: 1. Air in the air conditioning system: The system should be completely evacuated and refrigerant should be refilled; 2. Blockage in the air conditioning system: Mostly caused by a blocked or malfunctioning expansion valve, which can be resolved by replacing the expansion valve; 3. Excessive refrigerant: The exhaust port feels hot to the touch, and the compressor produces liquid hammering sounds. The system should be completely evacuated and refrigerant should be quantitatively refilled; 4. Poor heat dissipation in the condenser: The section of the pipeline from the condenser outlet to the expansion valve inlet feels hot to the touch. Clean the dirt from the condenser and radiator fins; 5. Expansion valve failure: The low-pressure pipe has excessive condensation or frost. Check if the expansion valve is installed correctly.
I remember once during a road trip, the car's air conditioning suddenly stopped cooling. When I took it for inspection, it turned out the high pressure was too high. The mechanic explained there could be several reasons for this. If the condenser is clogged with dust or leaves, its heat dissipation efficiency drops, causing the pressure to skyrocket. If the fan stops working, the condensation effect worsens, especially in hot weather. Another common mistake beginners make is overcharging the refrigerant, which overloads the system and naturally increases the pressure. If the expansion valve gets stuck, reducing the refrigerant flow, it can also lead to higher pressure. Blockages in the system, like debris in the pipes, are another potential hazard. Since then, I've made it a habit to clean the condenser when washing the car and regularly check the fan and refrigerant levels to avoid costly compressor repairs. Safety first—don't overlook these small details.
