Why does the water temperature rise sharply when parked?

[PeytonLynn]

Because when the vehicle is parked, there is no flowing air coming in to cool the engine radiator, so the water temperature will rise. Below are the relevant introductions: 1. Car radiator: The car radiator is mainly composed of a radiator core, water pipes, cooling air fins, an upper water tank, and a lower water tank. The upper water tank is located on the radiator, and water pipes connect it to the lower water tank below the radiator. Hot water flows from the upper to the lower water tank and turns into warm water. 2. Coolant: Coolant, whose full name should be antifreeze coolant, means coolant with antifreeze function. Antifreeze can prevent the coolant from freezing and expanding the radiator or freezing the engine cylinder block when the car is parked in cold seasons. Antifreeze is not only used in winter; it should be used all year round. In normal car maintenance, the engine antifreeze should be replaced every year.