What Causes High Engine Temperature in BMW 523?
2 Answers
The causes of high engine temperature in BMW include insufficient engine coolant, malfunctioning temperature sensors, or faulty temperature gauges. Solution for insufficient engine coolant: Inspect the cooling circulation system, check the coolant level, examine the water pump and radiator fan operation. If necessary, clean the cooling circulation system to ensure it is unobstructed and functioning properly. Solution for malfunctioning temperature sensors or gauges: Check the engine lubrication status, verify the engine oil level and quality. The oil level should not be too high or too low. Replace the oil according to the maintenance schedule and use the specified oil type as required by the operation and maintenance manual.
Last time I took my old 523 for a countryside trip, I also encountered the temperature gauge jumping up rapidly, so I quickly pulled over and turned off the engine. To summarize, it's usually caused by these common issues: First, the coolant is leaking or low—older cars often have seepage at hose connections, radiator, or water pump seals. Second, the cooling fan isn’t spinning, especially noticeable during summer traffic jams. If the fan doesn’t kick in when you turn on the AC, it’s likely the motor or thermostat switch is faulty. Third, the thermostat is stuck closed—this part acts as a valve for the cooling system, and if blocked, the antifreeze can’t circulate. Fourth, the radiator is clogged with insect remains or willow catkins—remember to ask the car wash crew to rinse the radiator gaps during cleaning. The key point is: if the temperature gauge hits the red zone, don’t push it! Immediately stop, turn off the engine, and turn on the heater to help dissipate heat. Wait for it to cool down before troubleshooting, or you might end up needing an engine overhaul!
