Misalignment of the accessory pulleys or a faulty drive belt tensioner may cause a chirping or squeaking sound while the engine is running. In If the replacing the belt tensioner does not correct the noise, the alternator pulley may require replacement.
Car Problem Reports
Dodge Caravan Belt Noise Due to Pulley Misalignment or Belt Tensioner
Dodge Caravan Problem
Engines Affected: 3.0L V6, 3.3L V6
Average Mileage: 123,028 mi (85,000 mi - 187,000 mi)