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Will the Fan Run if the Thermostat is Broken?

2 Answers

MacBennett

07/29/25 3:55pm

The thermostat controls the operation of the cooling fan. If the thermostat is broken, it cannot control the fan. Methods to determine if the thermostat is functioning properly: 1. Inspection after starting the engine: Open the filler cap of the cooling water tank and observe if there is any water flow inside. If there is no flow, it indicates that the thermostat is damaged or there is debris stuck between the main valve and its switch. 2. Judging by feeling the temperature of the upper and lower radiator hoses: Start the engine and after 3 minutes, touch the upper and lower hoses. If the thermostat is working properly, the temperatures of the upper and lower hoses will differ—generally, the upper hose will be hot while the lower one will be cool. When the engine coolant temperature reaches 90°C, both hoses should become hot, indicating the thermostat is functioning correctly. If the temperatures of the upper and lower hoses remain the same after starting the engine, the thermostat is not working properly.

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DelTaylor

08/15/25 3:53am

If your car's thermostat is broken, it's hard to say whether the fan will turn or not, because it's not directly related to the fan itself. The fan is controlled by the temperature sensor and electronic controller. For example, once I encountered a situation where the thermostat was stuck, the water temperature soared, and the fan immediately started spinning wildly to cool it down, which almost scared me. But if the thermostat is always open and not closed, the engine temperature may not rise, and the fan may not even bother to turn, which could waste fuel or damage the engine. So the key is to observe the water temperature. A broken thermostat mostly causes abnormal temperature, and the fan is just a passive response. If you notice the temperature gauge keeps rising or not rising at all, check the thermostat and the entire cooling system immediately to avoid major problems. During routine maintenance, regularly changing the coolant and inspecting small components can prevent issues before they arise.

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