Santa Fe. Cap for the Hybrid Inverter Coolant Reservoir. Engine Cooling. From 03/01/2012. From 05/12/2011. From 06/08/2012. From 09/27/2012. Inverter Cooling. Korea Built Vehicle. Location-Filler Neck. Location-Reservoir. Radiator Cap. To 04/25/2017. To 05/08/2017. To 05/10/2017. USA Built. Assembly -. Drive Coolant. Filler. Included with: Filler Neck, Radiator, Radiator Assembly, Reservoir, Reservoir Assembly, Reservoir tank.