A turbine stator vane with an ID endwall and an OD endwall and a vane airfoil extending between the two end walls. Each endwall has formed within a forward section a vortex tube arrangement of two separated vortex tubes that extend from one side of the endwall to the opposite side, and each of the separated vortex tubes are connected by a row of feed holes to supply cooling air and each is connected by a row of discharge slots to discharge a layer of film cooling air in front of the airfoil leading edge. The feed holes and the discharge slots are offset from the tube central axis in order to generate a vortex flow within the tubes. The vortex tubes are also connected with mate face cooling air holes to discharge some of the vortex flow cooling air onto the two mate faces of the enwalls to provide sealing and cooling for the spacing between adjacent endwall mate faces.