For many drivers, summer means longer trips and more frequent car use. However, high temperatures are not always easier on a car. The heat quickly highlights weak points, especially if they have already begun to form earlier. BMW cars are valued for their quality and driving pleasure, but this does not mean that their maintenance can be postponed. According to LLLParts specialists, faults in the cooling, air conditioning, electrical system and rubber parts are more often observed in summer. This is relevant for both 3-series or 5-series models, as well as larger X3 and X5 cars. Especially for those who already have higher mileage.
Engine overheating
One of the most dangerous summer faults is engine overheating. BMW engines operate at precisely controlled temperatures, so even a small deficiency in the cooling system can quickly cause problems. This could be a weak water pump. Sometimes the thermostat is to blame. It happens that coolant disappears through an old hose or expansion tank. Such malfunctions often occur in older N47, B47 or N57 diesel engines, but gasoline BMWs are not immune to them either. The engine code in itself does not mean anything bad. The most important thing is the maintenance history. According to LLLParts experts, it is worth checking the coolant level before a long trip. The radiator should also be inspected. If the fan is running unusually loudly after a trip and the fluid level is gradually decreasing, it is better not to wait for a dashboard warning.
Air conditioning system malfunctions
In summer, the air conditioner works almost every day. Therefore, problems with the compressor, condenser or pressure sensors become apparent more quickly. A weak air conditioner does not always mean only a lack of refrigerant. Sometimes there is a leak in the system. Sometimes the compressor simply does not turn on as it should. A common mistake is to just top up the system and hope it’s enough. If the fault is mechanical, topping up will not help. If the refrigerant leaks somewhere, the problem will return in a few weeks. In this case, diagnostics are required first, and only then are the right parts.
Electrical system malfunctions
Heat also affects the electrical system. In the summer, people often drive short distances in the city. At that time, the air conditioner, fans and multimedia are working. A weak battery may no longer withstand such a load. BMW electronics are sensitive to voltage fluctuations. As a result, various errors may occur temporarily. One day, the start-stop system stops working. The next time several warnings light up, they disappear after a new start. According to LLLParts specialists, before replacing expensive control units, it is worth checking simpler things: the battery, charging and contacts. When searching for BMW parts, it is important to choose parts for a specific model, engine, and year. Externally similar components are not always suitable for different BMW versions.
Rubber parts and belts
In the summer, people drive more with passengers and luggage. The suspension is under greater load. Heat also accelerates the ageing of rubber. Therefore, bushings, engine mounts, belts and hoses can start to cause problems, especially in the warm season. A slight clatter over bumps, a squeaking belt or the smell of oil after a longer trip should not be considered a trifle. Such signs usually get worse.
