Fixing Noisy Air Conditioner

There are several factors why an air situation produces noise.
At times loose hardware is the culprit. Air conditioner noise could be induced from the refrigerant tubing
that has a bend in it that produces rattling mainly because it's as well close to other elements of the air conditioner.

You can appropriate this by meticulously bending it back into it's original spot. Take a search at the unit and see
if there are any loose parts that could be banging about causing the noise. It might be the fan blades have gotten bent over time. To remedy this merely bend them back to their original position.