One of the pulleys is out of alignment,usually it is the tension pully. Replace it and problem will go away.
You can do that by replacing the tensioner
Here it is:
by taking it to a mechanic
no!
The serpentine belt on a 2003 Dodge Dakota is replaced by loosening the belt tensioner and slipping the belt off. It can then be removed from the engine accessories and a new belt installed.
There should be a diagram under the hood for that year.
Go to www.autozone.com and look under specifications, belt routing. On a 1989 Dodge Grand Caravan, the diagram is on the side of the engine where the S-belt is located.
Check all of the pulleys to make sure they are running in a straight line.
Not sure ,but it costs $115 to change mine on my 1998 Dodge Durango.
It is the item in the serpentine belt that is the lowest and furthest forward.
The belt tensioner is self-adjusting.
Fit a new belt tensioner