What are the causes of high pressure in car air conditioning?

[DiLola]

The causes of high pressure in car air conditioning: 1. System blockage, mostly due to expansion valve blockage or malfunction, the solution is to replace the expansion valve; 2. Excessive refrigerant, the exhaust port feels hot to the touch and the suction port feels warm, normally these areas should feel cool, the compressor may occasionally make liquid impact sounds, the solution is to completely evacuate and quantitatively recharge the refrigerant; 3. Poor cooling of the condenser, the temperature of the pipeline from the condenser outlet to the expansion valve inlet feels hot to the touch, normally this section should feel warm, the solution is to clean the condenser and radiator grille of dirt, replace if necessary; 4. Expansion valve failure, the low-pressure pipe will have a large number of dew drops or frost, the solution is to check if the expansion valve is installed correctly, if correct, replace the expansion valve; 5. Other faults, such as cooling fan failure, engine overheating, excessive or insufficient refrigeration oil.