Engine cooling system having EGR cooler

An engine cooling system provided with an exhaust gas recirculation (EGR) cooler, comprising:

• a cylinder block;
• a cylinder head provided over the cylinder block;
• a coolant pump configured to pump coolant to a coolant inlet of the cylinder block;
• an EGR cooler in fluid communication with the coolant pump;
• a first coolant temperature sensor configured to sense a first temperature of coolant discharged from the cylinder head;
• a second coolant temperature sensor configured to sense a second temperature of coolant flowing from the coolant pump to the cylinder block;
• and
• a coolant control valve unit that is provided downstream a coolant outlet of the cylinder head, wherein the coolant control valve unit is configured to receive coolant from the cylinder head,
• wherein the coolant control valve unit is configured to control a coolant flow to at least one part based on the first temperature and the second temperature.