What are the inspection methods for automotive air conditioning system malfunctions?
2 Answers
Automotive air conditioning system malfunction inspection methods are: 1. Check if the condenser fan operates normally; 2. Observe the frosting condition of the low-pressure circuit - surface frosting is normal; 3. Listen for any abnormal noises or knocking sounds during compressor operation - presence indicates malfunction; 4. Feel the high and low-pressure pipes of the refrigeration system - hot high-pressure pipe and cold/icy low-pressure pipe indicate normal operation; 5. Use a leak detector to check for leaks at all connection points of the system. Precautions for air conditioning usage include: 1. Avoid setting temperature too low; 2. Control air vent direction; 3. Avoid prolonged usage; 4. Appropriately activate high airflow mode; 5. Turn off AC during low-speed driving.
When encountering car air conditioning issues, I usually start with a self-check: After starting the vehicle, turn on the AC switch and feel for cool air coming out of the vents. If the air is only slightly cool or not cool at all, there might be a refrigerant leak or compressor problem. Next, listen for the sound of the compressor running—normally, it's a soft hum. If there's a clicking noise or no sound at all, it could indicate an issue with the electrical system or the belt. I also make it a habit to check if the cabin air filter is too dirty, as dust buildup can affect airflow. To check for leaks, I apply soapy water to the pipe connections—if bubbles form, there's a leak. Remember to stay safe during self-checks: avoid touching hot engine parts to prevent burns. It’s best to have a pressure gauge to measure refrigerant levels; if readings are abnormal, get it repaired promptly to avoid minor issues becoming major ones. Regular AC maintenance can significantly reduce problems—I have a professional technician inspect the system seals every six months.
