What Causes High Radiator Temperature?
2 Answers
Reasons for high radiator temperature: 1. Insufficient coolant level—it should be promptly replenished to the appropriate level; 2. Malfunctioning cooling fan—when the vehicle operates at high speeds, the generated heat cannot be effectively transferred to the coolant, leading to poor heat dissipation and resulting in issues like coolant overheating and boiling; 3. Faulty water pump—issues such as seized bearings or damaged impellers (though bearing seizure is less common) can occur. Common impeller damages include cracks or detachment from the pump shaft, slowing down coolant circulation and causing engine overheating; 4. Clogged radiator—the radiator has numerous fins forming small gaps that can easily accumulate debris, dust, or sludge, obstructing airflow and reducing cooling efficiency.
I've been driving for decades and have encountered high engine temperature several times, usually caused by insufficient coolant or expired/contaminated antifreeze. Radiator blockage is also a major issue, such as insects or dust clogging the grille, reducing cooling efficiency. A non-functioning fan is another common cause, possibly due to a faulty motor or electrical circuit failure. Once during summer traffic congestion, my engine overheated - I immediately pulled over and found coolant leakage from aged, cracked pipes. High engine temperature shouldn't be taken lightly as it can cause severe engine damage from overheating. Always check coolant levels regularly and use qualified antifreeze. During hot weather, pay extra attention to the temperature gauge and pull over immediately if it rises rapidly. Regular radiator cleaning is also a good maintenance habit.
