The following is the treatment method of BMW engine overheating: 1. Poor cooling water circulation: If there is air in the cooling system, air resistance will be formed, resulting in excessive engine temperature. You can use the following methods to deflate the engine and let it run at high speed. Gently unscrew the water tank cover until the gas is released. At this time, some cooling water will flow out with the gas. 2. Thoroughly vent the gas: Repeat this for many times until the gas is completely vented (at this time, the temperature of the upper and lower water pipes will be significantly different from that before venting). After troubleshooting, the cooling water should be replenished in time. 3. Dirty radiator: If the vehicle runs on dirt roads or muddy sections for a long time, some dirt will stick to the radiator, which will affect the heat dissipation effect over time and cause the water temperature to be too high. In this case, the radiator grille can be blown with compressed air first.