A heat sink for power modules can be incorporated into a power module of a machine. In embodiments, an alloy is extruded to form a body with a plurality of divider webs integral thereto and defining a plurality of longitudinal passage segments inside the body. The body is machined to remove alternating end portions of the divider webs to define a fitting end turn area and a return end turn area disposed in opposing relationship with each other, thereby forming a serpentine fluid passage. A fitting end cap is welded to the body. A fluid inlet and a fluid outlet of the fitting end cap are respectively in fluid communication with a passage inlet and a passage outlet of the serpentine fluid passage.