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My air conditioner is making a tinny sound when it runs--both when I run the fan only and the AC.

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Many noises on aircons come from a resonant frequency and can be sorted by slight re-alignment of the unit. Sometimes pushing in a paper spacer can help. You should look inside and behind the louvre at the drum fan. There may be a build up of dirt causing it to be unbalanced and also making more noise.

Posted on Nov 13, 2009

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