What Causes the Engine Temperature to Rise During Normal Driving?
2 Answers
Normal driving with rising engine temperature can be caused by the following reasons: Low coolant level in the radiator. The engine relies on water cooling to lower its temperature. Although the coolant in the radiator depletes slowly, it still diminishes over time. Some car owners neglect to check the coolant level, leading to prolonged low levels and consequently high engine temperature. In such cases, the radiator needs to be refilled. Thermostat malfunction. Some drivers notice the engine temperature rising after just a few kilometers of driving, without any visible leaks in the hoses. This issue may stem from a thermostat that fails to open, preventing the car's cooling system from engaging in a full circulation cycle and causing high engine temperature. Replacing the thermostat is necessary here. Leaking hoses. If a leak is detected while driving, inspect whether the hoses are aged or cracked. This issue is relatively easier to identify, and the solution involves replacing the affected hoses at a repair shop. Poor radiator cooling. Some car owners use plain water as coolant. Prolonged use of water can lead to rust formation in the engine and radiator, impairing the radiator's cooling efficiency and resulting in high engine temperature. To resolve this, the rust must be removed first, followed by cleaning or replacing the radiator.
As an experienced driver, rising water temperature during normal driving is quite common, and the problem usually lies in the cooling system. Insufficient or aged coolant is the primary cause, which reduces heat dissipation efficiency and leads to temperature rise. A thermostat stuck in the closed position cannot regulate coolant flow, causing rapid heat buildup. A damaged water pump that prevents smooth coolant circulation can also cause a sudden spike in water temperature. Additionally, if the radiator fan malfunctions and doesn't spin or spins too slowly, it fails to dissipate heat effectively. I recommend pulling over immediately to check: feel the radiator hoses to see if the temperature is uneven; check if the fan is spinning; and top up the coolant if the level is too low. Regular maintenance is crucial—replace the coolant every two years to avoid internal corrosion and blockages that can cause overheating issues. Otherwise, engine overheating may damage cylinder head gaskets, leading to costly repairs.
