A traction battery thermal management system is provided. The thermal management system includes a battery loop for regulating the traction battery temperature. A motor loop is provided for regulating a motor temperature. The thermal management system also includes a radiator. A radiator valve selectively controls fluid flow through the radiator. A battery valve selectively couples the battery loop and the motor loops. The battery loop, the motor loop are in fluid communication and arranged in parallel to be cooled by the radiator.