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Re: AC blower fan
What has most likely happened is the blower fan stem is loose on the fan motor shaft.The hard part is getting access to the motor and fan. Usually it is under the dash on the passenger side. It is an easy fix once have access.
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Are you referring to the blower motor inside the car? If so, they get leaves in them which puts them out of balance and makes them noisy. Just take out the blower, 3 screws, and clean it. That's the cheap answer. It can be a bad blower motor.
It is possible that a stray leaf or piece of debris is stuck in the blower fan blades. This is more likely if the noise began suddenly. You will have to access the blower and remove it to inspect the blades. If their isn't an obvious debris problem, the blower fan bearing may be wearing out and getting noisy; although this noise would slowly get worse and worse every day.
the noise is the drain on the belt drive system upon AC start up, the belts may need to be tightened or the AC compressor clutch is in need of replacement, if you are saying when car stops you mean the engine is shutoff then this statement does not apply but if you mean when the vehicle comes to a stop at say a stop light then it applies.
You probably hit one of the veins on the squirrel cage, mounted on the fan motor. You might be able to take the fan out and straighten these, to get the vibration out, if not you'll have to replace the whole fan. Good luck. I hope you can straighten it and don't have to replace.
sounds like the reiculation door is not moving, listen for a change in sound when you
move the knob from fresh air to recirculate. if no change, you will need to check the recirc, actuator or door inside the blower
Yes, your theory sounds right. You'll need to remove the blower motor or a cover on it to visualize the squirrel cage and remove whatever is causing the noise. In some vehicles there is a cover under the hood, which when removed, will allow you to inspect the blower housing. If no such cover, you'll need to remove the blower motor.