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Originally Posted by Chuck v
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(So good links, but old to the) TIP of TIGHTEN THE MOUNTING BOLTS IN THE RETURN GRILL AREA can help vibration, but also consider a toothbrush CLEANING (GENTLY, DRY FIRST, THEN w/ spray cleaner, so that you do NOT bend the blades) of the FAN BLADE/ SQUIRREL CAGE BLADES of the blower and / or the condenser fan, can help REDUCE VIBRATION. Good TARGET FOR SPRING CLEANING if not a current bad issue.