Just bought a 93 accord lx with 169k...I was told a new timing belt was put on less than a year ago, brand new battery and the ac unit was converted? After the car gets warmed up...it has a slight squeal on one of the belts while idling but when on the gas it would stop Was told to use Prestone belt dressing to see if squeal would stop. After spraying it made it worse...had same squeal while idling and now a worse squeal when on the gas. Turned the ac on while driving and the squeal stopped but then the battery light comes on not long afterward. Any thoughts or suggestions?

 

Check the tension on the belt that goes around the a/c and alternator (serpentine belt). The alternator is the pivot. I would tighten it by one turn, then test it out. Then repeat until the noise goes away.

There are three bolts that need to be loosened on the alternator to tighten the tension bolt.