Water level indicators let people know how much coolant or water their radiator can access. They are useful when fixing cooling system hose leaks. Water level indicators can also indicate if there is a slow leak.
Automobile engines create a significant amount of heat while they run, and radiators are designed to keep engines from overheating. When a radiator does not have enough water or coolant, it cannot function properly, which can lead to significant engine damage if the engine is allowed to get too hot. Water level indicators are needed to ensure that the radiator has access to the right amount of water or coolant.
If a cooling system does not have enough liquid, it will not be able to remove heat fast enough. If it has too much coolant, it might not flow at the right speed. In addition, too much liquid can cause pressure to rise too high in the radiator and its hoses.
In some cars, the water level indicator can be difficult to see. Before changing the fluids, the person changing fluids need to check carefully to find the right line. Proper lighting is also important as opaque reservoirs can be difficult to see. It is recommended to have a flashlight on hand when checking the water level indicator.