What are the reasons for BMW engine overheating?
2 Answers
The reasons for BMW engine overheating include: too much dirt on the surface of the radiator, thermostat failure, coolant not being replaced for a long time, etc. Most cars use water-cooled engines, which rely on the continuous circulation of coolant within the engine for heat dissipation. The coolant has two circulation paths in the engine: one is the major cycle, and the other is the minor cycle. When the engine is just started, the coolant circulates in the minor cycle, allowing the engine to warm up quickly. Once the engine reaches its normal operating temperature, the coolant begins the major cycle to maintain the engine within a normal temperature range. BMW models include the BMW 3 Series, BMW 5 Series, BMW X3, BMW X1, etc. Among them, the BMW 5 Series has body dimensions of 4998 mm in length, 1901 mm in width, and 1559 mm in height. The domestically produced 5 Series is a high-end sedan.
I've personally experienced the issue of engine overheating in my BMW before, and it was quite a scare when the red warning light lit up on the dashboard. The most common cause is a problem with the cooling system, such as insufficient coolant, often due to small cracks in the radiator or hoses causing leaks, which makes the car protest when temperatures rise. A non-functioning fan is also a big deal—if it fails, heat dissipation becomes a problem. Additionally, too much dirt or bugs clogging the radiator can block airflow, preventing heat from escaping. When the water pump fails or the thermostat gets stuck, coolant can't circulate, causing the engine to heat up rapidly. This kind of overheating not only makes the car run hot but also damages the engine, potentially shortening its lifespan. After my inspection, I found out the fan motor had burned out—replacing it fixed the issue. It's important to regularly check coolant levels, rinse the radiator during car washes, and keep an eye on the temperature gauge before long trips. Prevention is always cheaper than repairs.