Is a car's water temperature of 100 degrees Celsius normal in summer?

[GraceAnn]

It is abnormal for a car's water temperature to reach 100 degrees Celsius in summer. Extended information is as follows: 1. Under normal circumstances: Check whether the liquid level in the coolant replenishment tank is appropriate; then start the engine and observe the water temperature gauge as the temperature gradually rises. Feel the upper radiator hose with your hand, and it should gradually warm up; the lower radiator hose should remain almost unchanged in temperature. 2. After the engine warms up: The cooling fan also operates, but when the water temperature exceeds 95°C, the lower hose may be slightly cooler than the upper hose. The reason is that the thermostat opening is insufficient, reducing the coolant circulation flow, and the amount of water flowing from the engine into the radiator decreases, causing the engine's heat to not be dissipated in time, thereby increasing the engine's coolant temperature. 3. When the water temperature gauge rises to 95°C: Both the upper and lower hoses should be equally hot to the touch. The reasons could be a damaged cooling fan or circuit, a faulty thermal switch on the radiator, or a blown fuse. A blown fuse is often accompanied by or hides early faults in the circuit or fan.