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Jul 11, 2022 — The most common reason for a pulsating noise is the compressor failing. The compressor is responsible for moving refrigerant throughout your AC . Queenie Sateen Jules Jordan, Thumping Noises in HVAC Units. Thumping noises may also be caused by a bent fan blade hitting some other part of the housing. Advertisement. Ducts. Coming from your ductwork, thumping noises . Knot Sandals Heels, Why Is My Air Conditioner So Loud?. Jul 29, 2021 — Most units have some minor pulsation emanating from them, which is normal. However, this pulsing should be barely audible unless you are . Low Heel Clog Sandals, What causes air conditioner noises and how to fix them?. When the pump noises during the shutdown, this could be attributed to the high pressure within the pump itself. Your heating unit will occasionally make sounds . Low Heel Peep Toe Sandals, 6 Air Conditioning Sounds Decoded | Lakeside Heating & AC. May 11, 2022 — These grating, high-pitched sounds may appear during start-up. 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But if your blower motor slows down unusually and makes a humming sound when it has slowed down, it might be due to a fault in the capacitor and the motor.NBS Special Publication. 1978 · ‎Weights and measuresPuget Sound ; Tidal inlet field study ; Inlets , coastal ; Inlet stability ; 167-10182-410-00 . . Pump pulsing ; Hydraulic pulsing ; 048-10195-630-70 .