What is the high water temperature of the old BMW 525i?

There are many reasons for the high water temperature of the car, which can be summarized as: 1, the engine coolant is insufficient; 2, water temperature sensor or water temperature meter failure; 3. Long-term downwind driving or low-speed and heavy-load driving in hot season; 4. The ignition time is too early or too late; ; 5. The blinds cannot be fully opened; 6. The mixture is too thin or too thick; 7. The water tank is dirty outside or has serious internal scaling, resulting in poor heat dissipation, and the water tank needs to be cleaned or replaced; 8. The engagement time of the fan clutch is too late or the cooling fan doesn't work, the rotation resistance of the fan is too great, the blades are installed backwards, and the blades are damaged. 9. The performance of the electric fan is poor or the speed is not high; 10, too much carbon deposit in the combustion chamber; 1 1, the water pump belt is too loose; 12, there is something wrong with three-way catalysis; 13, the punching phenomenon is caused by air and water; 14, the thermostat doesn't open well and needs to be replaced;