Abnormal Noise from Car Air Conditioner Blower?
2 Answers
It may be caused by the blower blades hitting debris. Here is a detailed introduction to the relevant content: Introduction: The car air conditioning system includes the compressor, dryer, evaporator, high and low pressure pipes, and expansion valve. Typically, the air conditioning cycle involves four processes: compression, condensation, expansion, and evaporation. Ordinary air turns into low-temperature, low-pressure gas after these processes, and the blower's role is to blow this gas out through the air conditioning vents. Troubleshooting: Remove the dust filter cover on the drain trough cover and take out the dust filter. Turn on the blower switch to make it rotate, and observe that there is no debris around the blower impeller, indicating that the noise is not caused by the first reason. After removing the central vent, listen again and feel that the noise is coming from inside. Remove the entire dashboard, then take out the middle connecting piece of the air conditioning duct. It is found that there is a layer of sponge attached to the temperature adjustment flap, with a black plastic film glued to it. Half of this plastic film has separated from the sponge on this car, and when the blower is working, this black plastic film flutters in the airflow, causing the abnormal noise.
The car's air conditioning blower is making noise, possibly due to debris stuck in the blades, such as leaves or dust accumulated on the fan for a long time, causing friction and noise when rotating. Or the bearing may be worn and aged, lacking oil lubrication, which can cause squeaking. I suggest first parking the car, opening the engine compartment, and simply cleaning the debris near the air outlet. If the noise persists, check if the motor is loose or damaged. Do not disassemble it randomly to avoid damaging the wiring. Pay attention to regular cleaning during maintenance, and close the windows when parking to prevent dust from entering, which can effectively reduce such problems. Address it promptly, otherwise the noise will affect driving comfort, and prolonged exposure may lead to earlier failure of the air conditioning system.
