Ford Repair Questions? Ask a Mechanic for Answers ASAP
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There is a bulletin out for the o-rings leaking.It really sounds like you are getting the run around with this mechanic.He cannot keep charging you for his mis diagnosis.
It is possible that the idler pulley bearing or the alternator bearing is making noise,but certainly not all of them.I would see about getting your money back at least for the labor and diagnosis.