Patent ID: 7845339

Claim:
A cooling system for use with an engine having a cylinder head, the cooling system comprising: a heat exchanger; a pump coupled to the heat exchanger; an exhaust gas recirculation (EGR) cooler coupled to the pump; [and] a first valve between the EGR cooler and the heat exchanger wherein when the first valve is in a first position, the first valve directs a coolant to the heat exchanger and when the first valve is in a second position, the heat exchanger is bypassed and coolant flows directly to the pump; and a second valve coupled to the cylinder head and the heat exchanger, wherein when the second valve is in a third position, the second valve directs a coolant to the heat exchanger and when the second valve is in a fourth position, the heat exchanger is bypassed and coolant flows directly to the pump, wherein when the first valve is in the first position, the first valve directs a coolant downstream of said second valve.