My 2.0 TDI has started making a bit of a squeaking noise. It is definitely a belt squeaking. I sprayed some WD40 on the alternator belt at the front of the engine bay and it made the noise go away straight away but the next morning the noise returned. Does the belt just need replacing or could it be bearings causing the noise ?
Also, how difficult of a job is it to swap over the alternator belt ?