What are the symptoms of a faulty thermostat in the Volkswagen Tiguan?

[DiTyler]

Symptoms of a faulty thermostat in the Volkswagen Tiguan are as follows: Thermostat malfunction: If the thermostat opening is too small, the engine's large and small circulation cycles are affected, preventing effective heat dissipation. This leads to an increase in engine coolant temperature, triggering the coolant temperature warning light. If the thermostat fails to open, the temperature gauge will display a reading in the high-temperature zone. Engine abnormal noise: If the thermostat opening is too large, the engine coolant temperature remains too low, causing slow temperature rise, increased fuel consumption, and abnormal engine noise. Engine vibration: A sticking thermostat can easily lead to carbon buildup, resulting in unstable engine idle speed and causing engine vibration.