Discover why your fan is making jet engine noises and how to fix it.
That grinding sound is metal-on-metal wear caused by high-temperature lubricant breakdown in the motor bearings.
Thermal expansion creates shaft play, causing the fan to vibrate against the rear chassis shroud.
Manufacturers design these units for short lifespans, hoping you buy new instead of repairing them.
Always unplug your unit for 24 hours to safely discharge internal capacitors before starting repairs.
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