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Ihave a Bryant by Carrier model 376CAV108095 furnace purchased in 1991. The last two years the unit rattles all the time or with just the fan on like there is a loose component inside. It is a downflow. I checked the heat tubes I could reach from the AC coil and nothing is loose. The rattle is not coming from te circ blower either , it is somewherer in the middle. How do I fix the problem?

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G'day

It sounds like a worn bearing for the fan, rattling because of the clearances and the slightly out of balance fan blades. Replacing the motor, or having it re bushed will fix the problem. A unit of this age, has pretty much reached the end of its life anyways. May be time for a replacement.

regards
robotek

Posted on Sep 14, 2008

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Hey,

If the noise is not coming from the fan, then something is most likely loose. I think you will have to take the AC apart and find what is making the noise, possibly loose screws - bolts. Something possibly gotten loose over the years.

Posted on Sep 14, 2008

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