Get recommendations on recognizing caution symptoms together with exotic noises or smells coming from an air conditioner; early detection

http://www.mediafire.com/file/eezfmkqve1vddmg/pdf-13196-51385.pdf

Get ideas on spotting warning indicators reminiscent of abnormal noises or smells coming from an air conditioner; early detection ends up in well timed interventions stopping added harm down the road!