Vehicle cooling system

A vehicle engine cooling system:

• a primary cooling circuit having a primary radiator and a coolant pump for circulating coolant through the engine and the primary radiator;
• a secondary cooling circuit having a secondary radiator and an engine air cooler, the coolant pump circulating coolant through the engine, the engine air cooler and the secondary radiator, the primary cooling circuit operating at a temperature which is lower than an operating temperature of the secondary cooling circuit;
• a liquid/air charge air pre-cooler receiving engine inlet air from a turbocharger compressor, the coolant pump circulating coolant through the charge air pre-cooler and through the secondary radiator;
• and
• a fan for blowing cooling air through the primary radiator and the secondary radiator, the secondary radiator being downstream of the primary radiator with respect to flow of cooling air.

A vehicle engine cooling system:

• a primary cooling circuit having a primary radiator, a coolant pump for circulating coolant through the engine and the primary radiator;
• a secondary cooling circuit having a secondary radiator and an exhaust gas recirculation (EGR) cooler, the primary cooling circuit operating at a temperature which is lower than an operating temperature of the secondary cooling circuit;
• a liquid/air charge air pre-cooler receiving engine inlet air from a turbocharger compressor, the coolant pump circulating coolant through the EGR cooler, through the charge air pre-cooler and through the secondary radiator;
• and
• a fan for blowing cooling air through the primary radiator and the secondary radiator, the secondary radiator being downstream of the primary radiator with respect to flow of cooling air.