Hi Larry,
What is the make ,model # of your A/C's? Some of them have one motor that runs both the condensor and evaporater fans on the same shaft. You may find debris that has collected under the cover. I'd clean it and dab some silicone caulk on the areas that may be vibrating.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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