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Hi Mike. It's the top belt (the one that runs vertically from top to bottom of engine), which I believe is the timing belt, which doesn't move when turning the engine with the key. The other belt, at the bottom, does turn - I presume this is the drive belt? Car mileage is 193000kms, but I don't know when the belt was last changed as the vehicle was left to us in a "deceased estate".
2003 Jetta left rear window blue plastic part of the