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Thanks for the advice. A nearby wall was re-stuccoed and a bunch of the stuff fell into the cabinet. It was after I cleaned out the mess that I found I still had a buzz. Coil grille was also noisy...

6 year old Lennox 10ACC unit. Runs good but makes a pulsating buzz at the compressor. Not the fan. Sorry for this: sounds like zzt, zzt, zzt, ... pulses about 118 times per minute. Hosing down the...