Dorman OE Solutions Power Steering Idler Pulley. The Idler Pulley removes the slack from the accessory belts. Most vehicles either have a serpentine belt or separate accessory belts. These belts wont work on their own, and require the idler pulley to function correctly. Designed to fit and install like the original, Dorman OE Solution products specifically cover those original parts with high failure rates. Many of Dorman OE Solutions products are new-to-the-aftermarket, offering the service dealer a better alternative to the OE Dealer. These parts have been re-engineered to be better than their original OE design.