What Causes the BMW Engine Hood to Overheat?

[MacSadie]

BMW engine hood overheating may be caused by excessive dirt on the radiator surface, thermostat failure, or prolonged lack of coolant replacement. Solutions for thermostat failure: After starting the engine, check for water flow in the cooling tank; inspect whether there is water flow at the radiator inlet pipe; observe the temperature gauge to see if it shows any abnormalities. Solutions for excessive dirt on the radiator surface: Radiator blockages can be internal or external. When cleaning, pay attention to the types of debris on the radiator surface. For dry leaves, mud, etc., you can first use a brush to slowly clean, removing larger debris before using a high-pressure water gun for washing. When using the high-pressure water gun, adjust the nozzle to a spray pattern and avoid angling it towards the radiator fins, as this can easily bend the fins and affect performance. If there is a lot of willow catkins or similar debris on the radiator, avoid using water for cleaning. Fluffy materials like willow catkins stick to the fins when wet, making them hard to remove and impairing heat dissipation. It's best to use a brush to clean them bit by bit, then remove the radiator and use high-pressure air to blow from the inside out.