What temperature range is maintained by the thermostat?

The thermostat plays a critical role in managing the engine's operating temperature by regulating the flow of coolant to the radiator. The correct temperature range maintained by the thermostat is typically around 188°F to 203°F. This range is optimal for ensuring efficient engine performance and reducing wear on engine components.

At temperatures below this range, the coolant stays in the engine to help it reach its optimal operating temperature more quickly. Once the coolant temperature reaches the higher end of the range, the thermostat allows it to flow to the radiator to be cooled, thus preventing the engine from overheating.

This functionality is essential because maintaining the engine temperature within this range supports proper combustion and keeps the emissions system functioning effectively. Operating outside this range could result in inefficient fuel consumption or potential engine damage.

In contrast, other choices either represent temperatures that are too low or too high for optimal engine operation, which might lead to overheating or insufficient engine performance.