What Causes the Noise in Car Fan Blades?
3 Answers
The causes of noise in car fan blades are as follows: 1. Deformation of the fan blades in the air conditioning system, it is recommended to replace the fan. 2. Damage to the motor of the fan in the air conditioning system, it is recommended to replace the fan. 3. Excessive impurities in the air conditioning system, it is recommended to clean the air conditioning system. More details are as follows: 1. The car radiator consists of three parts: the inlet chamber, the outlet chamber, and the radiator core. The coolant flows inside the radiator core, while air passes outside the radiator. The hot coolant cools down by dissipating heat to the air, and the cold air heats up by absorbing the heat from the coolant. 2. The materials and manufacturing technologies for car radiators have advanced rapidly. Aluminum radiators, with their significant advantages in material lightweighting, are gradually replacing copper radiators in the passenger car and light vehicle sectors. Meanwhile, copper radiator manufacturing technology and processes have made substantial progress, with copper brazed radiators showing clear advantages in engine radiators for buses, construction machinery, and heavy-duty trucks. 3. Overseas passenger cars are mostly equipped with aluminum radiators, primarily for environmental protection reasons (especially in Europe and the United States). In Europe, aluminum radiators account for an average of 64% of new passenger cars. 4. From the perspective of the development prospects of China's car radiator production, brazed aluminum radiators are gradually increasing. Brazed copper radiators are also being applied in buses, trucks, and other engineering equipment.
Last time my car's fan was also making a loud noise, and upon inspection, I found leaves stuck in the gaps between the fan blades, causing a flapping sound when rotating. Additionally, fan blades can sometimes become deformed or loose, leading to an unbalanced rotation and a buzzing vibration. The fan bearings may also wear out over time due to lack of lubrication, producing a harsh grinding noise. Another issue is when the fan shroud gets deformed and touches the blades, creating noise. More seriously, motor problems can arise, where aging causes continuous noise amplification. When cooling is insufficient, the fan spins at high speed, making the noise more pronounced. If you encounter this situation, immediately turn off the engine and check, clearing any debris or tightening the blades. However, bearing issues require professional attention—I later went to a repair shop and replaced the bearings to fix the problem. Ignoring minor fan issues can lead to engine overheating and major repairs, so don’t overlook them.
A few days ago, I heard a rattling sound from the fan and initially thought the car was about to break down. Later, a car-savvy friend taught me: first check if there's a stone or plastic bag stuck in it. I parked, popped the hood, and sure enough, a small piece of plastic was caught in the fan blades. After removing it, the noise disappeared. However, some situations are more complex: if the fan blades themselves are bent or deformed, they might scrape against the guard when rotating. Worn bearings can produce a whining friction sound. A loose fan belt can also cause unusual noises. Motor aging may result in a screeching sound upon startup. For DIY solutions, you can remove debris like leaves or adjust the belt tension. For more complicated issues, it's best to visit a repair shop to check the bearings and motor. Last time I replaced a bearing, it cost me over 300 yuan.
