What is the reason why the car's water temperature hasn't risen after driving for an hour?

1 Answers
MacJayden
07/29/25 9:01pm
The reason why the car's water temperature hasn't risen after driving for an hour is that the thermostat is damaged and cannot close, causing the coolant to continuously circulate in the large loop, which rapidly lowers the engine's water temperature; the cooling fan is faulty and constantly running, causing the water temperature to drop quickly; or there is insufficient coolant. Below are the relevant details: Solutions: Check if there are issues with the cooling system, such as: whether the shutters are blocked, whether the fan blades are deformed, or whether the water temperature sensor and circuit are short-circuited. The thermostat can be removed and placed in water at different temperatures to observe its opening behavior. If it cannot open and close normally, the thermostat needs to be replaced. Hazards of low water temperature: It leads to incomplete fuel combustion, reducing the engine's efficiency; incomplete fuel combustion causes carbon buildup, increasing fuel consumption and polluting the environment; prolonged operation of the car at low temperatures accelerates wear and tear on the engine's internal components.
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