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What is causing the shaking and rumbling in central a/c?

I have a 2002/Trane/model# TWE048P13F80/ 1/2hp. The unit is rumbling loudly and shaking near the top so hard it can be felt and heard inside house.The unit is cooling fine. The outside
portion where the fan is seems to be OK. Any ideas?

Thanks!
Gail
Gail, July 2007
Indoor unit might be unbalanced, see if it is. If not might be problem with fan blower motor.

Paul, August 2007