What are the causes of the high temperature issues in the Besturn B50?
3 Answers
The following are the reasons for the high temperature in the Besturn B50: 1. Electrical circuit failure: The electronic cooling fan does not rotate, reducing the radiator's heat dissipation capacity. At this time, check the operation of the electronic fan. Unplug the electronic fan's wire connector and directly power it with a power line. If the electronic fan rotates, it indicates that it is working properly; if it does not rotate, it indicates damage. 2. Mechanical failure: The fan coupling lacks oil, is damaged, or stuck, causing the cooling fan not to rotate. When the engine runs for a long time, the water temperature is high or even boils. This is generally caused by the thermostat failing, resulting in poor water circulation. After the water temperature rises, the thermostat valve does not open, and the cooling water does not circulate in a large loop, thus failing to dissipate heat and regulate the water temperature. In tropical regions of southern China or in emergencies, the thermostat valve can be removed. 3. Improper assembly: For engines that have undergone major repairs or are newly assembled, during the installation process, high water temperature often occurs due to mismatched dimensions or fitting clearances. For a newly overhauled and assembled engine, running at medium speed for about half an hour may result in high water temperature. This is generally due to the gap between the piston or piston ring and the cylinder being too small. Prolonged operation can also cause issues such as stuck rings, broken rings, and cylinder scoring.
I've seen quite a few cases of the Besturn B50 overheating, with cooling system failures being the most common. A clogged radiator or low coolant level leads to poor heat dissipation, especially when scale buildup causes the water temperature to skyrocket. A stuck thermostat is also troublesome—if it fails to open the main circulation loop, the engine can't cool down. If the water pump's impeller is damaged, it can't circulate the coolant properly; I've seen cases where owners kept driving until the pump bearings were completely worn out. A non-functioning fan is even more critical, as there's no airflow for cooling when idling, causing the temperature gauge to spike rapidly. Another often-overlooked issue is a blown head gasket, where coolant leaks into the cylinders, producing white smoke. Older cars also tend to have leaking hose connections, slowly losing coolant without notice. I recommend first checking the coolant level and radiator cleanliness. If overheating occurs, pull over immediately—engine seizure repair costs are terrifying.
Common overheating issues encountered with the Besturn B50 often stem from several typical causes. Firstly, thermostat failure can cause coolant to circulate only within the engine's internal small loop when stuck. Secondly, wiring issues with the cooling fan, such as a burnt relay or poor plug contact, may prevent the fan from operating. Radiator clogging due to internal scale buildup is also quite common, especially in vehicles that have used tap water for extended periods. Water pump leaks can lead to coolant loss, and insufficient pump rotation due to belt slippage can impair circulation. Additionally, incorrect engine ignition timing generates excess heat from incomplete combustion that the cooling system cannot handle. During inspections, it's advisable to check the temperature difference between the upper and lower radiator hoses—a discrepancy indicates the large circulation loop isn't functioning. For maintenance, a thorough radiator flush every two years and cleaning the fins with a high-pressure air gun prove highly effective.
