What are the symptoms of a faulty thermostat in a Mercedes-Benz?

[KalebDella]

Symptoms of a faulty thermostat in a Mercedes-Benz include coolant leakage and engine overheating. Thermostat issues: If the thermostat is stuck open or opens too early, it causes the cooling system to enter the large circulation cycle prematurely. When the external temperature is very low, especially when the car is moving, the cold air quickly cools the antifreeze, preventing the engine water temperature from rising and resulting in no heat from the heater. Water pump impeller damage: If the water pump impeller is damaged or slips, it reduces the flow rate through the heater core, preventing sufficient heat from being generated. Air lock in the engine cooling system: An air lock can cause poor circulation in the cooling system, leading to high water temperature and no heat from the heater. If there is always air in the cooling system, it is likely due to a damaged cylinder head gasket allowing gas to enter the cooling system. If the inlet pipe of the heater core is very hot while the outlet pipe is relatively cool, this indicates a blockage in the heater core, which should be replaced.