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What causes intermittent operation of a car blower?

1 Answers

JordanLynn

07/29/25 9:27am

The intermittent operation of a car blower may be caused by prolonged use and excessive dust accumulation, which increases the friction coefficient between the rotor and bearings, causing the rotor to become obstructed or even stuck, leading to overheating and damage of the coil. To fix this, after disconnecting the power, open the rear cover of the blower and add a few drops of lubricating oil (such as sewing machine oil) to the bearing sleeves at both ends of the rotor. While adding oil, manually rotate the blades until they move freely, which should resolve the blower issue. If the car vibrates when the air conditioning is turned on, there may be several reasons: 1. Dirty air conditioning filter: A dirty filter can cause excessive noise and abnormal sounds. 2. Debris in the blower fan blades: Foreign objects in the blower fan blades can lead to abnormal sounds. You can test this by turning on the blower without starting the engine to see if the noise occurs. If it does, the issue is likely with the blower. 3. Fan problems: Deformed air conditioning fan blades or a damaged fan motor. 4. Worn clutch bearing: A worn clutch bearing in the air conditioning pump can cause the engine noise to increase when the air conditioning is on. This component cannot be replaced separately and requires the replacement of the entire air conditioning pump assembly.

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