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Check to make sure that nothing is obstructing the fan blade causing the noise, if not then the bearings in the fan motor are more than likely going out causing the metal on metal noise.
Remove the fan and motor assembly from the hood (the fan motor will plug into the hood housing) and using an electrical motor cleaner (such as CRC electrical motor cleaner available from your local auto parts store) wash the motor and fan as completely as possible, lubricate the end bearings (sparingly) with a very light oil such as sewing machine oil, gun oil or as a last resort 3 in 1 oil. Hope this helps.
99 out of a hundred times - when the fan motor on a window unit 'makes noise and works intermittedly,' you have a bad fan motor which will require replacing.
Sounds as if the fan motor's bearings are making noise - which - would account for the fan working only part time. The reason being is that the 'bearing noise' you are hearing - is a result of the bearings being wore out - thus it causes the fan motor to heat up and 'go off' - on the internal overload' which is built into the fan motor.
Like I said above - most commonly the 'fix' is to replace the motor.
This is the fan motor making noise but the fan motor is probably ok. The main board supplies voltage to the motor and can cause it to make strange noises.
Is the noise clicking consistantly?or just on again off again?Yes there may be a faulty motor.Try removing the wires and tape them up then run the unit if there is still noise need more info .And to let you know yes they can be made into a low quality air compressor:) hope i helped :)
if the fan is making noise it can also due to dust collected in the fan winks towards it end.or the other option is motor getting weak and needs replacement.
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