What are the symptoms of a thermostat failure in a BMW 5 Series?

1 Answers
OJasmine
07/29/25 8:36pm
Thermostat failure in a BMW 5 Series may be caused by damage in the closed position or damage in the open position. Symptoms of thermostat failure include: Triggering water temperature warnings, reduced engine power; the electric fan running continuously; abnormal heating. Based on these symptoms, it is generally concluded that the thermostat is malfunctioning. A faulty thermostat usually causes poor flow in the lower radiator hose, leading to excessively high water temperature and triggering warnings. Subsequently, the electric fan will run continuously to provide cooling, as the large coolant circulation cannot be opened, causing the fan to keep running. Additionally, drivers may notice abnormal heating, especially at high speeds—the faster you drive, the lower the heating temperature becomes. Thermostat: It is an automatic temperature-regulating device, typically containing a temperature-sensing component that opens or closes the flow of coolant based on expansion or contraction. It automatically adjusts the amount of water entering the radiator according to the temperature of the coolant, altering the circulation range of the coolant to regulate the cooling system's heat dissipation capacity.
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