1. Engine overheating: One of the most common symptoms of a faulty thermostat is engine overheating. If the thermostat is stuck closed, it will not allow coolant to flow through the engine, causing it to overheat.
2. Irregular temperature gauge: A fluctuating or erratic temperature gauge can indicate a faulty thermostat. If the thermostat is opening and closing too quickly, it can cause the engine temperature to fluctuate.
3. Coolant leaks: A faulty thermostat can sometimes cause coolant leaks. If you notice a coolant leak, check the thermostat housing for cracks or damage.
4. Poor heating: If your car's heater is not blowing hot air, it could be due to a faulty thermostat. When the thermostat is stuck open, it allows too much coolant to flow through the engine, which can result in insufficient heat production.
5. Check engine light: In some cases, a faulty thermostat can trigger the check engine light. If the thermostat is not functioning properly, it can send a signal to the engine control unit (ECU), causing the check engine light to illuminate.
