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tensioner pulley

  1. M

    Tensioner "knocks" very loudly when AC is on. Stops immediately when I turn it off. PLEASE HELP! - watch video

    Hello! I am at my wit's end with this problem! I've taken it to two mechanics. I know one has replaced the tensioner and serpentine belt., The other said he did... I'm not so sure he really did. AC compressor, condenser, and flow (something) were changed under an extended warranty at a local...
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