What Causes Excessive High Pressure in Automotive Air Conditioning Gauges?
1 Answers
The causes and solutions for excessive high pressure in automotive air conditioning gauges are as follows: 1. Air in the system. The system should be completely evacuated and refrigerant should be refilled. 2. System blockage. This is often caused by a blocked or malfunctioning expansion valve. The solution is to replace the expansion valve. 3. Excessive refrigerant. Symptoms include the exhaust port feeling "hot" to the touch and the suction port feeling "warm" to the touch. Normally, these areas should feel "cool" to the touch, and the compressor may occasionally produce liquid hammering sounds. The solution is to completely evacuate the system and refill the refrigerant to the correct amount. 4. Poor condenser cooling. Symptoms include the section of the pipeline from the condenser outlet to the expansion valve inlet feeling "hot" to the touch. Normally, this section should feel "warm" to the touch. The solution is to clean the condenser and radiator grille of any debris, and replace them if necessary. 5. Expansion valve failure. Symptoms include the low-pressure pipe having excessive condensation or frost. The solution is to check if the expansion valve is installed correctly. If it is, replace the expansion valve. 6. Other faults. These may include cooling fan failure, engine overheating, or excessive or insufficient lubricating oil.
