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If a thermostat in engine stuck open what will happen to the engine?

If a thermostat in an engine gets stuck open, it can have several negative effects on the engine's performance and operation:

1. Engine Overcooling: With the thermostat stuck open, the engine coolant will continuously circulate through the radiator, causing the engine to cool down excessively. This can result in lower engine temperatures than the optimal operating range.

2. Delayed Warm-Up: The engine will take longer to reach its ideal operating temperature because the coolant is constantly flowing through the radiator, dissipating heat. This delay can lead to increased engine wear during cold starts and reduced fuel efficiency.

3. Reduced Heating Efficiency: The stuck-open thermostat can affect the vehicle's heating system, as the heater core relies on the engine's heat to provide warm air inside the cabin. With a cooler engine, the heater will produce less heat, resulting in reduced cabin comfort during cold weather.

4. Engine Performance Issues: Running the engine at lower-than-optimal temperatures can impact its performance. The air-fuel mixture might not vaporize properly, leading to incomplete combustion, decreased power output, and increased fuel consumption.

5. Increased Emissions: Due to the incomplete combustion, the engine may produce higher levels of pollutants and emissions, contributing to environmental concerns.

6. Potential Engine Damage: Over time, the engine's internal components may experience excessive wear due to the prolonged exposure to lower-than-normal operating temperatures. This could result in costly repairs or even engine failure in severe cases.

It is important to address a stuck-open thermostat promptly to avoid these issues and maintain the engine's optimal performance, efficiency, and longevity.