What is the reason for the Chery Tiggo 3's idle speed increasing when the water temperature rises?

[LaMaggie]

The reasons for the Chery Tiggo 3's idle speed increasing when the water temperature rises are as follows: Dirty radiator: When the radiator is dirty, its cooling capacity decreases. While driving, the airflow at the front of the car can help increase the radiator's ventilation and also directly remove some heat from the engine compartment, ensuring that the temperature remains barely within normal limits. However, when the car is stationary, the insufficient airflow from the electric fan can easily lead to overheating. Faulty cooling fan: If the cooling fan fails to rotate or has other faults that prevent it from operating at high speed, it will result in poor cooling. While driving, the airflow at the front of the car can compensate for this, but when parked, the lack of airflow assistance can easily cause overheating. Faulty water pump: Without a functioning water pump, the coolant inside the engine cannot circulate. When the engine is running, it is like boiling water, and the water temperature will quickly become abnormal. The most common water pump failure is damaged blades, which leads to low pumping pressure at low speeds, while at high speeds, it can barely maintain circulation.