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If it’s buzzing abnormally, it may be that the fan blades are hitting something. I have had something like this happen on older BMWs and also Corvette. In those cases, a small fan in the dash is used to pull air through a small grille on the dash over a temperature sensor to measure the cabin air temperature, and it can break (BMW) or come off/misalign (Corvette) and make buzzing sounds.
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