Which of the following does NOT contribute to tires getting hotter?

The correct choice highlights that low coolant levels do not directly contribute to tires getting hotter. Tire temperature is primarily influenced by factors like low air pressure, excessive speed, and heavy loads. Low air pressure causes increased rolling resistance, leading to more heat generation as the tires flex and deform while in motion. Excessive speed increases the rate of heat buildup in tires because the friction between the tire and the road is heightened, producing more heat. Similarly, heavy loads exert additional stress on tires, resulting in greater flexing and increased heat generation.

On the other hand, low coolant levels pertain to the engine's ability to regulate its temperature and do not directly impact tire heat. While overheating engines can affect overall vehicle performance, the parameters affecting tire temperature are connected to the tire conditions and vehicle operation. Therefore, low coolant levels do not play a role in causing tires to get hotter.