During driving, the car’s air conditioning system not only affects driving comfort but also directly impacts driving safety and work efficiency. A well-functioning air conditioning system can maintain a stable in-car environment in high temperature, high humidity, or extremely cold weather, reducing driver fatigue.
To help you better maintain your air conditioning system, we have compiled a detailed maintenance and troubleshooting guide.
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How to check if the air conditioning fan speed is significantly reduced?
(1) Check the air conditioning filter: The filter is usually located behind the glove box or on the front of the engine compartment. Open the protective cover, remove the filter, and observe whether its surface has accumulated a large amount of dust, leaves, or foreign objects. If it is heavily soiled, it needs to be replaced promptly. It is generally recommended to replace it every 12 months or 20,000 kilometers.
(2) Check the blower: Turn on the air conditioning and adjust it to the highest setting. Observe whether the sound is even and strong. Abnormal noise or significantly uneven fan speed may indicate that the blower blades are dirty or the motor is faulty. A multimeter can be used to test the motor resistance; if it deviates from the standard value, it needs to be repaired or replaced.
(3) Check the air ducts and dampers: Focus on checking the interior of the dashboard and the inlet/outlet air ducts, especially at bends where debris tends to accumulate. Manually switch the airflow mode (e.g., face, feet, defrost), listen to the damper operation sound to determine if it is clear and if the damper motor is functioning properly.
(4) Check the air conditioning system pressure: Use a professional air conditioning pressure testing tool to check the high and low pressure of the air conditioning system. If the pressure is not within the normal range, it may be necessary to add refrigerant or check other components of the air conditioning system.
02 How to check if the air conditioning is completely without airflow?
(1) Check the circuit and fuses: Refer to the vehicle manual to locate the air conditioning fuses and relays. Test the continuity of the relevant fuses and check if the relay pins are oxidized. Also, check if the battery voltage and grounding line are good.
(2) Check the blower: Open the vehicle hood and locate the blower. Check if the blower power connection is normal and if there is any looseness or corrosion. You can use a multimeter to measure the resistance value of the blower to determine if the blower is damaged. If the resistance value is infinite or abnormal, the blower may need to be replaced.
(3) Check the air conditioning control panel: Operate each button on the panel in sequence and observe whether the display and feedback are normal. Remove the control panel and check if the plug on the back is loose. If possible, try replacing the panel using a substitution method for testing.
(4) Check the air duct system: Systematically check the entire path from the air inlet to the air outlet. Focus on checking the inside of the air conditioning unit, each air outlet flap, and the connecting hose. Use an endoscope if necessary. Use a flashlight to check the inside of the air duct for leaves, dust, or other debris. If blockages are found, clean the air duct and vents. At the same time, check whether the air duct connections are loose or damaged to ensure that the air duct is unobstructed.
03 Preventive Maintenance Recommendations!
Conduct a comprehensive inspection of the air conditioning system at least once a year. It is recommended to perform a test before summer. After prolonged use of internal circulation, switch to external circulation regularly to keep the air fresh. Turn off the AC before parking, but keep the air supply running to help reduce moisture inside the air conditioning system. Regularly clean the condenser and water tank surfaces to ensure heat dissipation.
04 Important Notes!
Regular maintenance is key to ensuring the long-term operation of air conditioning systems. Most inspections can be performed by yourself, but for repairs involving refrigerants and in-depth electrical circuits, it is recommended to have them done by professional technicians to ensure safety and system reliability.
