02 Dodge Ram 1500 squeals constantly, It does get quieter when A/C is turned on but still squeals. I replaced the belt 2 years ago and it is still in good shape. What could be causing this noise?

Check for a tensioner pulley with a bad bearing. Save yourself some money by pressing out the old bearing and buying a replacement bearing online. They are easy to press-in. Shrink the new bearing by placing it in the freezer overnight--often they will drop in, especially if you heat the pulley with a hair dryer first.