Description
Warranty & Shipping
How-To & Tools
Product Reviews
Q&A
Vehicle Fit

This water pump is a new replacement part that has the following specifications.

Specifications

  • New not remanufactured
  • Replaces one of many dealer part numbers including: 12456113, 12458935, 12556449, 88894290, 89017439, 8890174390
  • Includes water pump pulley
  • Built to strict quality control standards
  • No core charge

Note: On 2003 and older models, if your thermostat housing does not fit, you may need to purchase a 2004 and newer thermostat housing. This is due to new design changes in the replacement water pump.

Your water pump is a major component of your engine cooling system. If the water pump fails, the engine will overheat causing it to shut down. Water pumps have an indicator that tells you when they are going bad. There is a small hole in the water pump right under the shaft in the middle that the pulley bolts to. As the water pump's bearings wear out coolant seeps by them and leaks through this hole. If you notice a few drops of coolant under the front of your engine this is an indicator your pump is failing. If a water pump fails it will cause engine overheating, and possibly further engine damage. If you have noticed little drops of coolant under the front of your vehicle then inspect the bottom of the water pump to see if it is dripping out of the indicator hole. If your water pump is the problem, then this part is for you. Replace your broken or leaking water pump now with this great fitting replacement part.

Item Condition: New

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

  1. step : Remove Intake Tube (1:10)
    • Start by using an 8 millimeter socket wrench to disconnect the negative battery cable.
    • Loosen the two clamps by the throttle body and air box.
    • Use a small flathead screwdriver to break the seal.
    • Lift the intake tube out.
  2. step : Remove fan shroud (1:50)
    • Remove the two 10 millimeter bolts with your socket wrench.
    • Unclip the small hose from the shroud.
    • Remove pins around fan shroud and gently work hose back and forth to pull fan shroud out.
  3. step : Remove fan (3:00)
    • Use a large adjustable wrench on the center nut.
    • Apply force on the wrench to break it loose.
    • Carefully pull fan out and set aside.
  4. step : Remove serpentine belt (3:30)
    • Start by double checking that your routing diagram is legible.
    • Draw out your own if it isn't to save time and confusion later.
    • Use your socket ratchet to loosen the 15 millimeter bolt located on the tensioner.
    • Turn your ratchet clockwise to release the tension and remove the belt.
  5. step : Drain radiator and disconnect hoses from water pump (4:33)
    • Release lower radiator hose and drain fluid into your drain pan.
    • Use your pliers to slowly squeeze the clamp and pull it back to drain the fluid into your catch pan.
    • Disconnect radiator hose by loosening and pulling back the clamp.
    • Use your small flathead screwdriver to gently pry up the hose and wiggle it off.
    • Make sure any water has drained out of it and set aside. Finally disconnect heater hoses.
    • Ensure that your catch pan is underneath to catch any water.
  6. step : Remove tension arm (6:40)
    • Use your wrench to remove the tension arm from the water pump.
    • Set aside.
  7. step : Remove water neck and remove pump (6:56)
    • Use your 10 millimeter socket wrench to remove the two bolts.
    • Use your torque wrench to remove the six bolts on the water pump.
    • Then using a sharp razor blade, scrape off any residual gasket material that could create a bad seal.
  8. step : Install 1A Auto water pump (8:18)
    • Put the new gasket plates on your 1A Auto water pump using the two bolts.
    • Seat the new pump and place bolts and use your torque wrench to gently snug them up.
    • Go back and torque them between 22 and 24 foot pounds.
    • Take the new O-ring that came with your 1A Auto and put it on your thermostat housing.
  9. step : Reassemble (10:10)
    • Reconnect all your hoses.
    • Put your belt tensioner back on and put your serpentine belt back on using your diagram.
    • Reassemble your fan, fan shroud, and intake pipe.
    • Finally refill with a 50/50 mixture of Dex Cool.
    • Listen for the sound of any leaks to make sure everything is connected properly.
    • Finally, reconnect the battery and start up the engine and run it for 30 seconds or so to circulate the coolant.
    • Double check your level of coolant to make sure it is at the right spot, and you are good to go.

Tools needed for replacement:

    General Tools

  • Drain Pan
  • Razor Blade / Gasket Scraper

  • Ratchets & Related

  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket
  • 15mm Socket
  • 8mm Socket

5.00/ 5.0
2 reviews
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GMC Waterpump
Part was received before expected day. And secured in bubble wrap in box within a box. How to video was good eat . Had part on in no time.. will definitely buy from 1A Aouto again!
July 20, 2017
Just what I needed...
This is exactly what I needed! It was exactly as described on the website and the delivery was very quick. I will be ordering more parts from here for sure. Thanks
July 10, 2018
Will this fit my car? Add a vehicle to make sure
Customer Q&A
Ask a question to 1A Auto customers who purchased the product
What is included?
Sara F August 24, 2017
The water pump and gaskets
Owen M August 24, 2017
water pump and the necessary gaskets.
Winston S August 24, 2017
The water pump and gaskets will be included as shown on our image. You must re use the mounting hardware however or purchase elsewhere.
Alex P August 25, 2017
All thats in picture. Water pump, pulley, gaskets. I changed my thermostat since it was apart, I had to get that separate.
Brian C September 1, 2017
As shown in the picture, the water pump assembly and new seals/gaskets are included.
CHRIS S September 6, 2017
Year Make Model Description
2004-2006Buick Rainier Buick Rainier Engine Water Pump V8 5.3L
2004-2006Cadillac Escalade Cadillac Escalade 4 Wheel Drive Engine Water Pump V8 6.0L
2004-2005Cadillac Escalade Cadillac Escalade Engine Water Pump for Rear Wheel Drive V8 5.3L
2003-2006Cadillac Escalade ESV Cadillac Escalade ESV Engine Water Pump V8 6.0L
2002-2006Cadillac Escalade EXT Cadillac Escalade EXT Engine Water Pump V8 6.0L
2004-2006Chevy Avalanche 1500 Chevy Avalanche 1500 Engine Water Pump V8 5.3L
2004-2006Chevy Express 1500 Van Chevy Express 1500 Van Engine Water Pump V8 5.3L V8 4.8L
2004-2006Chevy Express 2500 Van Chevy Express 2500 Van Engine Water Pump V8 5.3L V8 6.0L V8 4.8L
2004-2006Chevy Express 3500 Van Chevy Express 3500 Van Engine Water Pump V8 6.0L V8 4.8L
2003-2007Chevy SSR Chevy SSR Engine Water Pump V8 5.3L V8 6.0L
2004-2006Chevy Silverado 1500 Chevy Silverado 1500 Engine Water Pump V8 5.3L V8 6.0L V8 4.8L
2005-2006Chevy Silverado 1500 HD Chevy Silverado 1500 HD Engine Water Pump
2004Chevy Silverado 2500 Chevy Silverado 2500 Engine Water Pump V8 6.0L V8 5.3L
2004-2006Chevy Silverado 2500 HD Chevy Silverado 2500 HD Engine Water Pump V8 5.3L V8 6.0L V8 4.8L
2004-2006Chevy Suburban 1500 Chevy Suburban 1500 Engine Water Pump V8 5.3L V8 6.0L
2004-2006Chevy Suburban 2500 Chevy Suburban 2500 Engine Water Pump V8 5.3L V8 6.0L
2004-2006Chevy Tahoe Chevy Tahoe Engine Water Pump V8 4.8L V8 5.3L
2004-2006Chevy Trailblazer Chevy Trailblazer Engine Water Pump V8 5.3L
2006-2007Chevy Trailblazer Chevy Trailblazer Engine Water Pump V8 6.0L
2004-2006Chevy Trailblazer EXT Chevy Trailblazer EXT Engine Water Pump V8 5.3L
2006Chevy Trailblazer EXT Chevy Trailblazer EXT Engine Water Pump V8 6.0L
2004-2006GMC Envoy GMC Envoy Engine Water Pump V8 5.3L
2004-2006GMC Envoy XL GMC Envoy XL Engine Water Pump V8 5.3L
2004-2005GMC Envoy XUV GMC Envoy XUV Engine Water Pump V8 5.3L
2004-2006GMC Savana 1500 Van GMC Savana 1500 Van Engine Water Pump V8 5.3L V8 4.8L
2004-2006GMC Savana 2500 Van GMC Savana 2500 Van Engine Water Pump V8 5.3L V8 6.0L V8 4.8L
2004-2006GMC Sierra 1500 GMC Sierra 1500 Engine Water Pump V8 5.3L V8 6.0L V8 4.8L
2005-2006GMC Sierra 1500 HD GMC Sierra 1500 HD Engine Water Pump
2004GMC Sierra 2500 GMC Sierra 2500 Engine Water Pump V8 6.0L
2004-2006GMC Sierra 2500 HD GMC Sierra 2500 HD Engine Water Pump V8 6.0L
2004-2006GMC Sierra 3500 GMC Sierra 3500 Engine Water Pump V8 6.0L
2004-2006GMC Yukon GMC Yukon Engine Water Pump V8 6.0L
2005-2006GMC Yukon GMC Yukon Engine Water Pump V8 5.3L
2005-2006GMC Yukon XL 1500 GMC Yukon XL 1500 Engine Water Pump V8 5.3L
2004-2006GMC Yukon XL 2500 GMC Yukon XL 2500 Engine Water Pump V8 6.0L
2003-2006Hummer H2 Hummer H2 Engine Water Pump V8 6.0L
2003-2006Isuzu Ascender Isuzu Ascender Engine Water Pump V8 5.3L
2005-2006Saab 9-7X Saab 9-7X Engine Water Pump V8 5.3L
Part #: 1AEWP00066


Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout

How-to Video:

(12:46 min)