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Why is the engine temperature rising slowly?

2 Answers

OTheo

07/28/25 9:44pm

Car engine temperature rises slowly due to: thermostat damage or the radiator fan running continuously. The thermostat operates based on the engine's coolant temperature. If the thermostat malfunctions and the valve fails to close, the coolant will continuously circulate in the large loop, potentially causing the engine's temperature to remain too low. The engine temperature refers to the temperature of the antifreeze, which is a coolant with antifreeze properties. It prevents the coolant from freezing in cold winter conditions, which could otherwise crack the radiator or damage the engine cylinder block or head. The method for replacing antifreeze is: 1. Open the vehicle's engine hood, and locate the coolant reservoir in the upper right corner; 2. Open the antifreeze drain plug under the radiator to drain the old antifreeze; 3. Add new antifreeze, tighten the cap, and the antifreeze replacement is complete.

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LeMary

08/12/25 2:21am

Slow engine warm-up is quite common. I suspect the thermostat is stuck open—it should remain closed during cold starts to allow coolant to stay and heat up. If it's stuck open, the coolant circulates too quickly, preventing the engine from reaching optimal temperature. A malfunctioning cooling fan that runs constantly or a coolant leak leading to low levels could also be the culprit. This issue is more noticeable in cold weather, especially during winter. Ignoring it means the engine won’t warm up properly, leading to incomplete combustion, increased fuel consumption, and potential carbon buildup. The cabin heater may also underperform, reducing comfort. I recommend checking the thermostat and coolant level first—replacing a small component may solve it. Regularly monitor the temperature gauge while driving, and avoid prolonged low-temperature operation to protect the engine.

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