Hello, Having done 4 off these now only 1 tensioner was working all the others were stuck so that when the belt stretches it squeals, none rattled

On the st170 that I am playing with at the moment the rattle was the over braid on the exhaust flexi joint, also had rattles from the heat shield over the steering rack in the past

Suggest getting under the car and have a listen, going to be something loose