What are the damages to a car when the thermostat is broken?

[VanAva]

Damages to a car when the thermostat is broken: 1. The engine cannot operate at the optimal temperature, increasing engine wear and shortening its lifespan; 2. The engine oil cannot reach the optimal viscosity, increasing engine operation resistance and causing higher fuel consumption; 3. The engine cannot operate at the normal temperature. The thermostat automatically adjusts the amount of water entering the radiator based on the coolant temperature, changing the water circulation range to regulate the cooling system's heat dissipation capacity, ensuring the engine operates within the appropriate temperature range. When the coolant temperature is below the specified value, the refined paraffin in the thermostat's temperature-sensitive body remains solid, and the thermostat valve closes the channel between the engine and the radiator under the action of the spring. The coolant returns to the engine via the water pump, performing a small circulation within the engine.

[OliveMarie]

A faulty thermostat is no small matter! I've encountered a similar issue where the engine kept running cold, resulting in a significant increase in fuel consumption—costing several extra cents per kilometer. If it gets stuck and fails to dissipate heat, the engine can overheat instantly, which is terrifying: at best, the coolant temperature warning light flashes; at worst, it can cause cylinder head deformation or even cracking, potentially rendering the entire engine useless and costing thousands to repair. Additionally, emissions exceed standards, harming the environment. I recommend keeping an eye on the coolant temperature gauge regularly. If it fluctuates, get the thermostat checked immediately—replacing this small part can prevent major disasters. In the long run, it affects the entire cooling system, making components like the water pump or radiator more prone to failure, especially during long-distance drives. Remember, stable engine temperature is the heart of your car—don't overlook this detail!