Blower Fan Motor Noise

If your blower runs but is noisy buy just the motor fan assembly.

Blower fan motor noise.

The sounds happen in cold or humid weather and especially when hitting bumps in the road or slamming on the brakes. The blower motor is a small rotary motor that drives a fan sitting behind your vents pushing hot or cold air through them at varying speeds depending on your selection. We bought just the blower for the 14 year old heat glo gas fireplace shown here. If your interior ac heat fan blower motor is making noise like a card in a bicycle spoke then you probably just need to clean.

Once it is safe to touch examine the motor and look for any obvious signs of wear or breakage. Installing an acoustic rubber pad under the furnace specially if it is sitting on concrete will damp the vibration you hear through the pipes although the blower fan and motor are the most obvious parts to check take a look at the complete unit. During blower operation this debris causes the blower motor to be noisy. The sounds happen less when blower is on higher settings and all the time on lower speeds.

However if the motor doesn t run at all chances are it has a bad temp sensor or speed switch. If you hear a loud rattling noise it could be a minor issue like loose stones or debris that s caught in the condensing unit. Pipe brackets burner parts cold air returns access panels into the burner chamber and blower chamber or even the plenum itself could be loose. Your first step after noticing this sound should be to turn off your furnace s motor and let it cool down.

In that case buy a complete kit. There s a rattling or buzzing noise coming from the condenser unit when the fan is turned on. Squealing and screeching sounds coming from beneath the passenger side dash when the a c heat blower motor is on. Humming sound a humming sound is one of the most common blower motor noises reported by home owners.

Sometimes this noise is not due to a blower motor problem but occurs because debris is caught inside the blower assembly. Quiet a loud blower motor. Even though it s in a housing it lives in the engine compartment so it s not unheard of for foreign objects to get sucked into and wrapped around or caught in the fan. This debris often works its way down into the hvac system from the vent opening under your windshield wipers at the base of your windshield.

Blower motor mount squirrel cage plenum filter too small or the furnace itself vibrating.