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
Chrysler Town & Country Belt Noise Due to Pulley Misalignment or Belt Tensioner
Chrysler Town & Country Problem
Average Mileage: 104,155 mi (50,000 mi - 136,500 mi)
Visitor, 2007 Chrysler Town & Country, 83,520 mi
Noise from the Alternator/Serpentine Belt area when idle. Louder with A/C.
Visitor, 2003 Chrysler Town & Country, 121,000 mi
Just had idler pulley, tensioner, water pump, and serpentine belt replaced. Now hear a chirping noise when A/C is on.
Visitor, 2004 Chrysler Town & Country, 136,500 mi
Noise made by fan belt, when idleing, not a pleasant sound new belt did not help, need ideas to correct offensive sound!
Visitor, 2002 Chrysler Town & Country, 50,000 mi
during cold startup or turing at slow speed. Nver fixed it.
Visitor, 2002 Chrysler Town & Country, 122,220 mi
tensioner failed after replacing new belt and tensioner have a low idle chirp. help