Ford Repair Questions? Ask a Mechanic for Answers ASAP
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I assume that you had the work done in a workshop?
If so, have it checked again as soon as possible. From the description it sounds like either a defective pulley or a pulley which has come loose. Even a belt that runs crooked cannot be excluded.
This can lead to irreparable engine damage. You should go to the garage as soon as possible to have it checked. If it turns out that a pulley has come loose or the belt is running crooked, this is a reworking which should not cost you anything.
It's ok that you didn't drive, the car should be on the direct way to the garage.