Why does the engine temperature still rise after adding antifreeze?

[XavierAnn]

The reason why the engine temperature still rises after adding antifreeze is: improper addition and replacement of antifreeze, which causes premature blockage of the engine water channel and radiator, resulting in high engine temperature. Antifreeze should be replaced every two years, and original equipment manufacturer (OEM) antifreeze must be used during replacement and addition. If the concentration is too high, it will lead to poor heat dissipation and engine overheating. The full name of antifreeze is antifreeze coolant, meaning a coolant with antifreeze function. It can prevent the coolant from freezing and cracking the radiator or damaging the engine cylinder block or head when parking in cold winter. Antifreeze is a type of coolant containing special additives, mainly used in liquid-cooled engine cooling systems. It has excellent performance such as antifreeze in winter, anti-boil in summer, and anti-scale and anti-corrosion all year round.

[SanLucia]

I often encounter this issue, especially when I work on my own car. Adding coolant doesn't help when the temperature is too high. Coolant isn't a one-time fix; it only addresses freezing and boiling points. But if there are air bubbles in the cooling system, like what happened to me last time, the liquid can't circulate, and the temperature still skyrockets. If the water pump is stuck, it simply can't push the liquid, and if the radiator is clogged with rust, the heat can't dissipate. Then there's the thermostat—if it gets stuck in the closed position, it's a disaster, trapping all the heat inside the engine. The fan not spinning is also common; if the sensor fails, it won't start, causing overheating even at high speeds. When checking, feel the radiator—if it's unevenly hot and cold, you know there's a problem. You must bleed the system professionally or replace parts to prevent engine damage.

[Kayla]

Hey, I'm the kind of person who helps neighbors fix their cars. After adding coolant, the engine might still overheat, and it's not a fluid issue but something else. For example, a broken fan—it's responsible for blowing away heat, and if the sensor fails, it stops working. I've personally seen a thermostat stuck closed, and replacing it fixed the problem. Rust buildup inside the radiator is an invisible culprit; if the coolant can't flow, heat just builds up. Using water or low-quality coolant with a low boiling point won't help either—it'll still boil under heavy load. And if the water pump fails, a worn bearing can cause leaks. Start by checking simple things like whether the fan is spinning and if the radiator cap seals properly. Timely repairs protect the engine.

[AmirRose]

As a new driver, I just dealt with the same situation. Adding coolant but still having high water temperature really scared me. Turns out coolant alone doesn't fix the entire cooling system's issues. Air bubbles in the pipes create airlocks, hindering fluid flow. If the water pump is damaged, it can't circulate the coolant properly. A thermostat stuck in closed position blocks the path, causing rapid heat buildup. A dirty radiator also reduces cooling efficiency, and a non-functioning fan makes it worse. The lesson I learned: regularly clean and inspect key components to prevent minor issues from becoming major repairs. Safety first.