What Causes Loud Noise from Car Air Conditioning Blower?
2 Answers
Loud noise from a car air conditioning blower is usually caused by a dirty air filter leading to excessive noise, debris in the blower fan blades, and other factors. Below is an introduction to the causes of loud noise from car air conditioning blowers: 1. Causes: A dirty air filter causing excessive noise; debris in the blower fan blades; deformed fan blades or damaged fan motor in the car air conditioning system; worn clutch bearings in the air conditioning pump, which may cause the engine noise to increase after turning on the air conditioning. 2. Solutions: First, try turning on the blower without starting the engine. If the noise appears, it can confirm that the issue lies with the blower. Replace the air conditioning pump assembly.
When the blower in my car's air conditioning system is noisy, it's usually because foreign objects like small leaves or dust particles are stuck in the fan blades, causing imbalance and loud noise during rotation. Severe wear in the bearings after prolonged use can also produce a humming sound. A clogged cabin air filter is a common issue - accumulated dust increases air resistance, forcing the blower to work harder and louder. Last time I encountered this problem, I opened the glove compartment and found the filter completely covered in dust; replacing it made the system much quieter. If the bearings are damaged, professional tools may be required for replacement, which is beyond DIY capability. An aging or faulty blower motor can also cause noise. I recommend cleaning the filter every six months and closing windows when parked to prevent debris entry. Excessive noise isn't just annoying - it affects AC performance and increases power consumption/fuel usage. Address these issues promptly to avoid driver distraction or more serious malfunctions.
