What Causes the Car to Always Overheat?
3 Answers
The reasons for frequent high-temperature alarms in a car are as follows: 1. Circuit failure causing the electronic cooling fan to stop working, reducing the radiator's heat dissipation capacity. 2. Check the operation of the electric fan. Unplug the electric fan's wiring harness and power it directly with a power line. 3. If the electric fan rotates, it indicates proper functioning; if not, it suggests damage, requiring inspection of the relay and its circuit. 4. If the fan rotates with intact and powered wiring, it indicates a damaged or failed relay. 5. If all the above checks are normal, it suggests a damaged temperature sensor or its probe. The hazards of high-temperature environments to cars are as follows: 1. When the car is running, high external temperatures slow down tire heat dissipation, making them prone to overheating and excessive pressure, leading to tire blowouts. The faster the speed, the more heat the tires generate, increasing the likelihood of blowouts. 2. The braking efficiency of the car decreases as the temperature rises. For hydraulically braked cars, brake fluid may experience vapor lock at high temperatures. 3. Under frequent braking conditions, brake fluid temperature can exceed 100°C, easily causing the rubber cup to expand and brake fluid vapor lock, leading to reduced braking efficiency and compromised driving safety.
The car keeps overheating, and I must say this issue is quite common. I've seen many times that insufficient coolant is the main culprit. If the radiator is leaking or not filled enough, the system can't effectively dissipate heat. A faulty water pump causing poor circulation is also a major cause—once the fan blades get stuck, heat accumulates. A clogged radiator is annoying; dust and leaves blocking the vents make heat dissipation difficult. When the fan isn't spinning, check the electrical circuit, as relays or motors often fail. Persistent overheating can burn engine seals or even warp the cylinder head, leading to major repairs. For self-inspection, first check the coolant level, but avoid opening the cap when the engine is hot to prevent burns. Regular coolant changes and radiator cleaning can prevent issues. Drive safely and don't push the car until it stalls. Pay attention to how quickly the temperature gauge rises when parked.
My car used to overheat frequently, and it took a lot of effort to resolve the issue. That time, the thermostat was stuck and couldn't regulate the coolant flow, causing constant overheating warnings. Aging hoses leaking coolant were also a problem, with cracks at the joints leading to a drop in fluid levels. Using the air conditioning more in summer increased the engine load, causing it to heat up faster. The mechanic mentioned that the fan controller is prone to failure, which can stop the fan from running. I've learned to check for unusual noises and fluid levels after parking. Ignoring overheating can lead to dangerous engine seizure. It's best to use a diagnostic scanner to check for error codes and regularly clean the radiator fins to reduce dirt buildup. Emphasizing cooling system checks during routine maintenance is very helpful.
