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25% Off Select Parts and Accessories
Receive 25% Off Your Online or In-Store Purchase. Use promotional code MMJ25 at checkout to receive discount. Not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Those products that are included will be displayed in product search results and product detail pages. INCLUDES the following categories: Starters, Alternators, Fuel Pumps, Radiators, Shocks & Struts, Chassis, CV Axles, Batteries, Ignition, Window Motors, Wipers, Appearance Chemicals, Car Wash Accessories, Floor Mats, Lift Equipment, Hand Tools, Headlamps and Bulbs. Excludes the following brands: Powerstop, Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, Thule, Thule Karrite, JVC, Flowmaster, Hurst, B&M, MSD, Moog, Wagner and BBK Performance. Valid online until 2:59 am EST on 5/1/17.

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Water Pump


Water Pump

The water pump is the heart of the cooling system. Its primary function is to circulate antifreeze, also known as engine coolant, so that it can travel to and from the engine, radiator and heater core.

What is Water Pump and how does it work

How Does It Work?

  • Two different types? mechanical and electric
  • Both use an impeller that rotates in a circular motion to create the centrifugal force necessary pumping
  • Mechanical pumps, which are the most common, are driven by a pulley
  • A belt connects the water pump pulley to the crankshaft pulley, thus using the circular motion generated by a running engine to rotate the impeller
  • Electric pumps, as their name suggests, use electricity to operate the pump

How Is it Made?

  • A water pump is made using a cast iron, aluminum, stamped steel or plastic housing
  • Housing surrounds an integrated shaft, bearing, water pump seal and external pulley (mechanical only)
  • Components are pressed together as a unit
  • Sometimes components are held together with various fasteners

Why Does it Fail?

  • Internal seal or bearing failure

What are the Symptoms of Failure?

  • Antifreeze leaking from the pump
  • Pulley noise
  • Failure to maintain correct operating temperature

What are the Implications of Failure?

  • Engine overheating
  • Progressive component failure
  • Minor to severe engine damage

How Difficult is the Install?

Difficulty Rating:


  • Installation diffi culty varies by vehicle depending on pump location and access.

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