Part Details

  • Product Line: ACDelco Professional

Specifications

  • Brand New ACDelco Professional Water Pump
  • Not remanufactured or rebuilt
  • Built to strict quality control standards
  • No core charge
  • 2.02" diameter thermostat outlet
    • Will fit models with 1.88" Diameter, but buyer will need to purchase new thermostat that size

Item Condition: New

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

5.0 / 5.0
1 Review
5 Stars
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1 Star
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So far so good
I've put a couple hundred miles on the new water pump. No issues whatsoever thus far. Re-used the old thermostat. Everything I needed including gaskets came with the pump. Instructional video on YouTube helped. I would recommend looking up other videos on YouTube for help getting the radiator fan off. The ratchet strap method worked well for me. Great product.
July 7, 2017
Purchased
1 year ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 2 questions Browse 2 questions and 7 answers
Does the AC Delco professional water pump come with gaskets? 2002 gmc Sierra 4.8 vin V
Dane H on Dec 21, 2015
BEST ANSWER: Yes, this will come with the Gasket. This is the AC Delco part and will come exactly as you would receive from the dealer. Thank you and have a great day!
Does this water pump come with the fan clutch?
Jason F on Mar 20, 2018
BEST ANSWER: Nope, no fan clutch. Just the pump Not nearly as sturdy as the stock pump. It works but if I had to do it again I’d get an OEM even if it cost more.

Vehicle Fit

Year Make Model Description
2004Buick Rainier Buick Rainier Engine Water Pump V8 5.3L (8th Vin Digit P) ACDelco Professional ACDelco 252-845
2002-2003Cadillac Escalade Cadillac Escalade Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2002-2003Cadillac Escalade Cadillac Escalade Engine Water Pump V8 6.0L (8th Vin Digit N) ACDelco Professional ACDelco 252-845
2003Cadillac Escalade ESV Cadillac Escalade ESV Engine Water Pump V8 6.0L (8th Vin Digit N) ACDelco Professional ACDelco 252-845
2002-2003Cadillac Escalade EXT Cadillac Escalade EXT Engine Water Pump V8 6.0L (8th Vin Digit N) ACDelco Professional ACDelco 252-845
2002-2003Chevy Avalanche 1500 Chevy Avalanche 1500 Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2003Chevy Express 1500 Van Chevy Express 1500 Van Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2003-2005Chevy Express 2500 Van Chevy Express 2500 Van Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2003-2005Chevy Express 2500 Van Chevy Express 2500 Van Engine Water Pump V8 4.8L (8th Vin Digit V) ACDelco Professional ACDelco 252-845
2003-2005Chevy Express 2500 Van Chevy Express 2500 Van Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2003Chevy Express 3500 Van Chevy Express 3500 Van Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
1999-2003Chevy Silverado 1500 Chevy Silverado 1500 Engine Water Pump V8 4.8L (8th Vin Digit V) ACDelco Professional ACDelco 252-845
1999-2003Chevy Silverado 1500 Chevy Silverado 1500 Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2001-2003Chevy Silverado 1500 Chevy Silverado 1500 Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2002-2003Chevy Silverado 1500 Chevy Silverado 1500 Engine Water Pump V8 5.3L (8th Vin Digit Z) ACDelco Professional ACDelco 252-845
2003Chevy Silverado 1500 Chevy Silverado 1500 Engine Water Pump V8 6.0L (8th Vin Digit N) ACDelco Professional ACDelco 252-845
2001-2003Chevy Silverado 1500 HD Chevy Silverado 1500 HD Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2003Chevy Silverado 1500 HD Chevy Silverado 1500 HD Engine Water Pump V8 6.0L (8th Vin Digit N) ACDelco Professional ACDelco 252-845
1999-2000Chevy Silverado 2500 Chevy Silverado 2500 Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
1999-2003Chevy Silverado 2500 Chevy Silverado 2500 Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2001-2003Chevy Silverado 2500 Chevy Silverado 2500 Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2001-2003Chevy Silverado 2500 HD Chevy Silverado 2500 HD Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2001-2003Chevy Silverado 2500 HD Chevy Silverado 2500 HD Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2000-2003Chevy Suburban 1500 Chevy Suburban 1500 Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2002-2003Chevy Suburban 1500 Chevy Suburban 1500 Engine Water Pump V8 5.3L (8th Vin Digit Z) ACDelco Professional ACDelco 252-845
2000-2003Chevy Tahoe Chevy Tahoe Engine Water Pump V8 4.8L (8th Vin Digit V) ACDelco Professional ACDelco 252-845
2000-2003Chevy Tahoe Chevy Tahoe Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2002-2003Chevy Tahoe Chevy Tahoe Engine Water Pump V8 5.3L (8th Vin Digit Z) ACDelco Professional ACDelco 252-845
2003GMC Savana 1500 Van GMC Savana 1500 Van Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2003-2005GMC Savana 2500 Van GMC Savana 2500 Van Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2003-2005GMC Savana 2500 Van GMC Savana 2500 Van Engine Water Pump V8 4.8L (8th Vin Digit V) ACDelco Professional ACDelco 252-845
2003-2005GMC Savana 2500 Van GMC Savana 2500 Van Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2003GMC Savana 3500 Van GMC Savana 3500 Van Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
1999-2003GMC Sierra 1500 GMC Sierra 1500 Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
1999-2003GMC Sierra 1500 GMC Sierra 1500 Engine Water Pump V8 4.8L (8th Vin Digit V) ACDelco Professional ACDelco 252-845
2001GMC Sierra 1500 GMC Sierra 1500 Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2001-2003GMC Sierra 1500 GMC Sierra 1500 Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2002-2003GMC Sierra 1500 GMC Sierra 1500 Engine Water Pump V8 5.3L (8th Vin Digit Z) ACDelco Professional ACDelco 252-845
2001-2003GMC Sierra 1500 HD GMC Sierra 1500 HD Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2001GMC Sierra 1500 HD GMC Sierra 1500 HD Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
1999-2003GMC Sierra 2500 GMC Sierra 2500 Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
1999-2000GMC Sierra 2500 GMC Sierra 2500 Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2001-2003GMC Sierra 2500 GMC Sierra 2500 Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2001-2003GMC Sierra 2500 HD GMC Sierra 2500 HD Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2001-2003GMC Sierra 2500 HD GMC Sierra 2500 HD Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2001-2003GMC Sierra 3500 GMC Sierra 3500 Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2000-2003GMC Yukon GMC Yukon Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2001-2003GMC Yukon GMC Yukon Engine Water Pump V8 4.8L (8th Vin Digit V) ACDelco Professional ACDelco 252-845
2002-2003GMC Yukon GMC Yukon Engine Water Pump V8 5.3L (8th Vin Digit Z) ACDelco Professional ACDelco 252-845
2000-2003GMC Yukon XL 1500 GMC Yukon XL 1500 Engine Water Pump V8 5.3L (8th Vin Digit T) ACDelco Professional ACDelco 252-845
2002-2003GMC Yukon XL 1500 GMC Yukon XL 1500 Engine Water Pump V8 5.3L (8th Vin Digit Z) ACDelco Professional ACDelco 252-845
2000-2003GMC Yukon XL 2500 GMC Yukon XL 2500 Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2003Hummer H2 Hummer H2 Engine Water Pump V8 6.0L (8th Vin Digit U) ACDelco Professional ACDelco 252-845
2003-2004Isuzu Ascender Isuzu Ascender Engine Water Pump V8 5.3L (8th Vin Digit P) ACDelco Professional ACDelco 252-845
2005-2006Saab 9-7X Saab 9-7X Engine Water Pump V8 5.3L (8th Vin Digit M) ACDelco Professional ACDelco 252-845

This part replaces:

  • ACDelco 252-845
  • OE # 252782
Only 5 left in stock
Part #: 1AACD00070


Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout

AC DELCO
Brand #: 252-845

How-to Video:

(12:46 min)