Which component could affect temperature if it fails?

The thermostat plays a crucial role in managing the temperature within an engine or heating system. Its primary function is to regulate the flow of coolant through the engine based on the temperature, allowing the engine to reach its optimal operating temperature and maintain it. If the thermostat fails, it can become stuck in the open or closed position.

If it is stuck closed, the coolant will not circulate properly, leading to overheating as the engine temperature rises beyond safe levels. Conversely, if it is stuck open, the engine may not reach the desired operating temperature quickly, which can lead to reduced efficiency and increased wear over time.

This direct relationship between the thermostat's operation and temperature control makes it a critical component whose failure can significantly impact system temperature.