Why Does My Water Pump Keep Going On

The engine water pump is an important part of mechanical equipment. However, sometimes we find that the water pump seems to continue to run after the engine is turned off. Why is this? In addition, there is usually a drainage hole in the water pump. What does it do? In this article, MyMROmarts will explore these issues, explaining why water pumps keep running and the role of water pump drain holes.

Why Does My Water Pump Keep Going On

Now let's explain why the water pump sometimes keeps running after the engine is turned off. There are usually several reasons why this happens.

The Engine Still Has Residual Heat

Even if the engine is turned off, its temperature will not immediately drop to ambient temperature. The engine continues to radiate heat, which keeps the coolant at a certain temperature. Therefore, the water pump will continue to operate to maintain the circulation of coolant until the engine and other diesel engine parts have cooled to a suitable temperature.

Heat Diffusion

A water pump's impeller is typically housed inside the engine, making it vulnerable to the impacts of the engine's surrounding heat-generating components. The water pump must continue cooling to disperse heat even when the engine is off since ambient heat might still be transmitted to it.

Hydraulic Effect

The water pump may occasionally continue to run as a result of hydraulic effects. When the coolant in the water pump is heated, the coolant may expand, forcing some liquid out of the pump. If the liquid then circulates, the water pump will be able to keep working.

Why Does A Water Pump Have A Weep Hole

The drain hole on an engine water pump is usually located at the bottom of the pump. Its main function is to remove accumulated water and impurities inside the water pump. Running water pumps generate significant centrifugal forces that pull coolant from the engine and push it outside, where it is then recirculated via the engine cooling system. But when the engine stops, the water pump's impeller also stops moving, which might lead to coolant remaining inside the water pump and creating a dead zone.

The existence of the drainage hole allows the accumulated coolant and impurities inside the water pump to have an outlet and can be drained smoothly. To keep the water pump functioning normally and increase its lifespan, this is crucial. A water pump may get corroded and damaged if coolant and contaminants are allowed to build up inside it for an extended period of time. This will reduce the water pump's ability to cool the engine once the starter motor has started it.

Engine water pumps are crucial because they keep the engine's operating temperature constant by moving coolant throughout the engine. To guarantee that the water pump operates normally, the drainage hole on the water pump serves to eliminate collected water and contaminants inside the water pump. Knowing these causes will enable us to operate water pumps more effectively and ensure the functionality of mechanical devices.