Question about 1999 Buick Century

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I turn on my heat or fan or a/c, and get a humming sount, then i turn it up and it get more to a grinding sound or vibrating sound

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Sounds like the bloer motor is rubbing against fan blower housing.Tip cut a peice of garden hose a f ew feet long & use hose as listening device to isolate problem

Posted on May 23, 2011

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Posted on Jan 02, 2017

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I have a 2002 Grand Am SE, my heat works fine, temperature wise, but doesn't flow out of my vents very well. Whenever I turn the heat on I hear a loud humming/vibrating sound coming from my blower...


I had a very similar problem on a Buick recently. Like mine, your blower's fan blade assembly may have come loose from the motor shaft. There is a very small washer type clip that holds the fan blade part to the motor's shaft. Usually the whole blower assembly is pretty easy to get to and take off...usually. A lot of GM cars had the assembly accessed from the firewall behind the engine. You would need to pull the blower motor out and check the fan assembly.

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