During which mode is the coolant temperature between 190°F and 203°F?

The range of coolant temperature between 190°F and 203°F is typically associated with mixed mode. This mode occurs when the engine is operating both in a warming stage and actively trying to manage the peak temperatures of the coolant system. During mixed mode, the engine's cooling system may alternate between using the radiator and bypassing it to maintain optimal temperatures for efficiency and emissions control.

In contrast, other modes like bypass mode generally deal with the coolant not passing through the radiator, which would not maintain temperatures in this range. Radiator operating mode would typically be associated with lower temperatures as the coolant is being actively cooled, and cooling mode is utilized when the engine's temperature is significantly elevated, leading to cooler temperatures in the coolant flow. This context helps clarify why mixed mode is the correct answer.