Why does the car overheat even when it has enough antifreeze?

[VonLincoln]

Here are the reasons why a car may overheat despite having sufficient antifreeze: 1. Weather: The impact of high temperatures. 2. Overload: Overworking of the air conditioning system and failure of cooling components. 3. Car cooling system failure: Such as radiator leakage, insufficient coolant, deteriorated coolant, or blockage in the coolant circulation system. Below is additional information related to antifreeze: 1. Refill: When the antifreeze coolant level is found to be below the minimum (the normal capacity of antifreeze coolant should be between MIN and MAX), it is necessary to promptly refill the vehicle's water. 2. Replace antifreeze: When a new car reaches a certain mileage, typically every two years or 40,000 kilometers, the antifreeze coolant should be replaced.

[VanArcher]

I've encountered the issue of the car overheating despite having sufficient coolant many times, and it's mostly due to problems in the cooling system. The most common culprit is a malfunctioning water pump, which is responsible for circulating the coolant. If the pump fails or its shaft wears out, the fluid stagnates near the engine, unable to dissipate heat, causing the temperature to skyrocket. Another possibility is a stuck thermostat. Normally, it opens and closes based on temperature to regulate coolant flow, but if it gets stuck closed, the coolant can't reach the radiator, trapping the heat. The fan is also critical—if the electric fan's sensor fails or the fan stops working, the radiator surface doesn't get air-cooled, leading to overheating even with a full coolant level. The radiator itself might be clogged, with its internal channels blocked by rust or sediment, or externally covered by mud and leaves, hindering heat exchange. Additionally, a blown head gasket can allow combustion gases to leak into the cooling system, causing excessive pressure and high temperatures. If the overheating warning light comes on, never push the car—pull over, turn off the engine, and call for help immediately to avoid engine damage. I regularly inspect cooling system components, like cleaning the radiator and testing the water pump, which helps prevent many issues.