A cooling system has a diverter valve to selectively control the flow of coolant through an internal combustion engine having a cylinder block with a cooling jacket and a cylinder head mounted on the block with a cooling jacket. The inside of the actuator member includes a helical groove within an inner cavity. The multiplexer normally provides the input strobe signal as a multiplexer output signal to the delay circuit which generates edges in each of the first and second strobe signals in response to each edge in the multiplexer output signal with a programmable delay between corresponding first and second strobe signal edges. , cross-linked networks, semi-interpenetrating networks, or interpenetrating networks, and placed within the pericardial space or on one or more pericardial tissues.