Patent ID: 6886506

Claim:
An engine cooling system, comprising: a cooling passage formed within an internal combustion engine; a drain passage; a conduit disposed in fluid communication between said cooling passage and said drain passage; a poppet which is movable relative to said conduit between a first position and a second position, a liquid coolant being generally prevented from flowing through said conduit when said poppet is in said first position, said liquid coolant being generally permitted to flow through said conduit when said poppet is in said second position; a pressure regulating device associated with said poppet to urge said poppet into said first position; and a resilient sealing material overmolded on a sealing portion of said poppet, said sealing portion of said poppet being a flange extending from a body of said poppet, said resilient sealing material being formed on three surfaces of said flange.