The **windshield washer system** is essential for maintaining good visibility while driving, as it sprays a jet of fluid onto the glass to facilitate cleaning by the windshield wiper. It is important to **monitor the windshield washer fluid level** in its reservoir and refill it when it is low. This ensures that the system functions correctly and that the windshield remains clean, especially in rainy or dirty conditions.

On the other hand, the vehicle's **cooling system** is independent of the windshield washer system. Its function is to keep the engine at an appropriate temperature by using a coolant that circulates through the engine and radiator. This system is not related to the water supply for the windshield washer, so it is not necessary to monitor the coolant level for the operation of the windshield washer.

In summary, for the proper maintenance of the windshield washer system, it is crucial to ensure that there is always enough **windshield washer fluid** in the reservoir.