2003 Volkswagen Jetta squeaking noise!
As you probably know squeaking could be alot of things, but the most common noise, that would not effect performance, would be serpentine belts. You can buy a can of belt dressing at Autozone, that you spray on the inside, the contact side, of the belt. If it is the belt, this should help. If it's been a long time since replaced you may want to replace belt. Alot of those belts will break after being worn out, but the better quality belts may not break, but they will make a horrendous squealing noise. If it's not the belt, you'd have to have someone look at it to troubleshoot. Good luck.
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