The purpose of a car water pump is to push coolant through the car’s engine block, radiator and hoses to get the engine heat away from the system.

After the coolant enters the water pump, it goes through the whole engine, where it absorbs the heat that the combustion process produces, and then it goes to the radiator, so the heat can exit to the outside air.

Water Pump
Water Pump

When a water pump goes bad:

  • Coolant leak at the front-center of your car
  • Water-pump pulley is loose and making whining sounds
  • Engine is overheating
  • Steam coming from your radiator

Five Main Reasons Your Water Pump Fails

A water-pump may fail in more than one way. For example:

  • An old, worn out seal starts leaking coolant.
  • An over-tensed belt puts extra pressure on the shaft and bearing, which may lead to a broken shaft or bearing, and a leak.
  • A worn out or damaged bearing prevents your pump from properly rotating or at all, causing your engine to overheat.
  • Old coolant and rust buildup destroy your water-pump.
  • An old gasket gives in and leaks.


Also, The reasons why a water pump seal might begin to leak include:

  • High temperatures
  • Abrasive particles
  • Electrolysis

So, Corrosive inhibitors in the seal plating deteriorate in effectiveness over time and the coolant becomes more abrasive the more it is used, which is why regular flush-and-fills are recommended. Consequently, As the inhibitors deteriorate and the coolant’s abrasiveness increases, electrolysis on the seal face occurs and coolant is allowed to seep through it.

Making sure your water-pump is repaired before it causes engine damage is very important. So, Paying close attention to your vehicle and seeing the signs now can prevent serious inconvenience or permanent damage.