My guess is your compressor is making this noise and it may be from running in a high head pressure condition usually caused by a dirty condenser coil... Make sure this coil is cleaned regularly especially if you have pets that shed... Otherwise it could be a defect in the compressor and as long as you don't mind the clunking noise, run it until it quits... I've heard of some units making this noise for years... cheers, kooler
kooler
November 2007
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