Part Type: Accessory Drive Belt Idler Pulley. 2015 Western Star 4900FA Engine: 14.9L L6; Position: Fan and Water Pump;. 2011 Western Star 4900FA Engine: 14.9L L6; Position: Fan and Water Pump;. 2012 Western Star 4900FA Engine: 14.9L L6; Position: Fan and Water Pump;.
