If your air conditioner is making a humming noise, the culprit is likely dirt or dust. This is because kicking on the AC puts more of a load on the belt, which can expose any weaknesses that could be causing it to move unevenly through the pulleys.. 3. How to Stop Window Air Conditioner Vibrations. Fix: wedging a toothpick under the loose lower-right corner of the evaporator. What’s important here is listening to where the rattle is coming from. Compressor. Clean and Vacuum Inside the Window Air Conditioner. Or does it seem to be originating from the air conditioner unit itself? What causes the noise: A banging sound usually is a sign that there’s a loose component inside your compressor, like a connecting rod, piston pin or crankshaft.Additionally, a banging noise could mean you need a new compressor. Pulley: If the compressor pulley bearings are failing, they can make noises, generally a grinding, roaring or squealing noise. If you turn on the AC and immediately hear a rattling noise, there are a few potential causes: Compressor: If your AC compressor is beginning to fail, it can make a rattling noise. If your car’s drive, or serpentine, belt is itself starting to wear out, it can also cause a rattling sound when you use your air conditioner. This can result in a loud humming noise. ... Equip your window air conditioner with specialized accessories to prevent common window AC problems like proper support, dripping water, air leaks, air filtration, and storage. In most window air conditioners, there are two fan blades attached to the fan motor. Belt Noise. NOISY AIR CONDITIONER: Rattling and Shaking. Several factors can cause window air conditioners to vibrate and make distracting noises. It might make a rattling noise when it’s turned on at first, but that will go away quickly instead of remaining constant as it does with other window units. Indeed, fixing noisy window air conditioners often involves a good and deep cleaning of the AC unit, both inside and out. One of the fan blades is used to draw air through the evaporator coil … If it’s the air conditioner, you may have worn bearings in the fan motor, or the fan motor blades may be damaged. 7 Common Noises Your AC Might Make And Their Likely Sources. Depending on the size of the room you use it in, you might have to keep it set to auto cool to reach your ideal temperature. You should check whether your window air conditioner is vibrating or producing a rattling noise and if so, then it is not a normal situation. When air conditioning units get dirty, debris can impede the fan’s circulation inside the unit. Fortunately, many vibrations have easily remedied causes. Assure that none of the fan blades, louvers, vents, or air channels are caked with dirt and grime. Removing the entire plastic front panel, the buzz continued, and could be made to start or stop with pressure against the evaporator or the plastic housing/divider. Noise wise, these seem to be the perfect middle ground between a window and central air conditioner. Regular maintenance can reduce the noise to some extent but with the passing of time, there is bound to be an increase in the level of the noise. Surprisingly, most customers say the natural sound from window AC operation quickly becomes background noise, but the dripping sound can ruin a quiet night at home. Note: There can be many types of noises an air conditioner unit makes- such as rattling, squeaking, hissing, intermittent beeps, etc- and each of those can have multiple causes. If these noises seem to happen constantly, or throughout the time the air conditioner is running, there’s a good chance it’s one of these two issues: The unit is icing up. This window ac unit was previously our #1 pick for home use. 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