Rattles from Inside the Unit: A properly installed window air conditioner does not rattle during operation. If you hear rattles or vibrations coming from inside the unit, this is a signal that parts are loose or that gaskets are missing. Tighten any loose parts and replace gaskets to stop vibration inside the unit.Click to see full answer. Herein, why is my window AC making a rattling noise?Rattling – If you hear a rattling noise coming from an exterior AC unit, it could be because something fell into the vents, such as leaves, sticks, or other outdoor debris. A rattle could also indicate something as simple as loose bolts, screws, or fasteners. However, the sound could also be coming from the compressor.One may also ask, why does my window AC make a clicking noise? A clicking noise that starts off slow and progresses as the unit warms up could be coming from an obstruction to the fan or a bent fan blade. Just like putting a stick in a window fan, the click will occur every time the blades hit that obstruction until either the obstruction or the blade breaks away. In this manner, how do I stop my air conditioner from rattling? If a sudden loud rattle occurs, it could mean a small piece of debris got stuck in the outdoor air conditioner’s compressor fan. To fix it, turn off the unit and remove the visible obstruction. After removal, check for any damage done to the condenser coils, compressor, and fan.How do I stop my window air conditioner from making noise? Tips for Reducing Noise in Your Existing A/C Window Unit Be sure all the mounting screws are present and are tightened properly. If the window frame is vibrating, fill the gap with wooden shims or with foam weatherstripping applied to the A/C frame where it meets the window frame.

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