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Hi I'm Brian and I'll be happy to help you with this!
9 times out of 10 it is a weak fan motor run capacitor that causes this. I would replace the capacitor first and see if that solves it. They are cheap and available online or at your local appliance parts store. It will look like a small round or oval metal cylinder (very few are also gray plastic) and will have either two or three terminals on top. You will need to remove the side panel of your ac unit then likely the control panel cover that's revealed after removing the side panel. Behind that, you will find your fan motor run capacitor. It will likely also be the capacitor for your compressor as most units these days use what's known as a "dual run capacitor" for both the compressor and fan motor. It will be rated in Mfd and will likely be something like 35+5 Mfd at 370 volts ac or 40/7.5 @ 440Vac or something very similar. You can go up on the voltage (not down) but the Mfd ratings must match.
I should caution you, capacitors (especially blown ones) can hold a nasty charge even after the power is shut off to them. So with power shut off, you should take a screwdriver, and only holding the handle, short each capacitor terminal to the unit casing with the shaft of the screwdriver before touching them. This will ensure the capacitor is discharged and won't bite you!
Let me know if I can help further!
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