220V AC Cooling Fan sudden noise solution

"220V AC Cooling Fan" in use, suddenly issued a particularly loud noise. Even the sound is even bigger than the chassis power, after examination. The original loss due to long years of "repair", the fan and heat sink surface cracks gathered a lot of dust. "220V AC Cooling Fan" motor lubricating oil has completely dried up, so causing the motor-like roar.
Solution: "220V AC Cooling Fan" and radiator separation radiator can be cleaned with tap water directly. First wipe with a soft paper fan, a small gap between the available medical cotton swab to wipe. Open the plastic sticker fan on the back of the movement with ordinary sewing machine oil drip drip one drop to -2. You can also paste grease with a toy four-wheel drive, the amount should not be excessive.