1999 Dodge Caravan 6 cyl Front Wheel Drive Automatic 119000 miles
replaced serpentine belt and tensioner pulley due to a squeeky noise and still have the noise but can tell the sqeek is coming from that area. Any suggestions? Had one mechanic look at it and he applied some sort of oil or grease to something in there and noise went away for a good deal of time then when it got wet the noise started again!
Sight down the belt in three places. Next to the upper engine mount, the tensioner pulley, and the crankshaft. If you placed a straightedge along all three, they should be in straight alignment. If the section of belt on the tensioner sticks out even 1/16", there will be a squeal. Check that the tensioner is seated squarely and there's no dirt or other debris behind the mounting plate.
No anti-squeal chemicals should be used on serpentine belts. Dirt will stick to the belt and make the squeal worse.
Chrysler used to offer new belts with a part number that started with the letter " Q". We joked that it stood for " quiet". Don't know if that's true or not but it solved a lot of squealing problems.