ACDelco® 251-818 - GM Original Equipment™ Engine Coolant Auxiliary Water Pump

8 reviews|Item # mpn4851980626
Vehicle Specific
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    Replaces Original (OE) Part #:84115339
    Manufacturer
    $76.07 + Free Shipping
    In Stock (1) - Ships within 24 hrs
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    Vehicle Fitment

    Buick

    Specifications

    Inlet Inside Diameter (in)
    0.68 in
    Outlet Inside Diameter (in)
    0.69 in
    Outlet Outside Diameter (in)
    0.79 in
    Inlet Outside Diameter (in)
    0.79 in
    Outlet Quantity
    1
    Electrical Connector Quantity
    1
    Inlet Quantity
    1
    Voltage (VDC)
    12 VDC
    Inlet Inside Diameter (mm)
    17.23 mm
    Outlet Inside Diameter (mm)
    17.65 mm
    Inlet Outside Diameter (mm)
    20 mm
    Outlet Outside Diameter (mm)
    20 mm
    Material
    Plastic
    Good Maintenance Practices - Section 1 - Bullet 4
    A stain around the weep hole is acceptable. However, if a weep occurs with the engine running and the coolant system pressurized, then the water pump should be replaced.
    Product Description
    An ACDelco GM Original Equipment Engine Auxiliary Water Pump is used in some vehicles to pump engine coolant during certain operating conditions. While your engine's main water pump is mechanically driven and stops when the engine does, an auxiliary water pump is electric and able to circulate coolant after the engine is shut off, keeping coolant flowing to where it needs to go. These original equipment auxiliary water pumps have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors. ⚠ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
    FAQ - Question 3
    Can a malfunctioning water pump harm my engine?
    Good Maintenance Practices - Section 1 - Bullet 1
    Clean all excess dirt and debris from the water pump housing.
    FAQ - Question 2
    Do all water pumps look the same?
    FAQ - Question 4
    Does the water pump affect the temperature inside the passenger compartment of my vehicle?
    FAQ - Question 5
    Does the water pump work when my vehicle is turned off?
    Signs of Wear & Troubleshooting - Section 1 - Bullet 2
    Engine Overheating - If your vehicle's engine overheats, it may not be receiving the required coolant flow. Make sure that your vehicle's cooling system contains the proper level of coolant.
    Signs of Wear & Troubleshooting - Section 1 - Header
    Signs of wear for heater water pumps include but are not limited to:
    Features & Benefits - Bullet 2
    GM-recommended replacement part for your GM vehicle's original factory component
    Good Maintenance Practices - Section 1 - Bullet 3
    Inspect for leakage at the water pump outlet housing or the rear cover gasket, and leakage at the water pump vent or weep hole.
    Signs of Wear & Troubleshooting - Section 1 - Bullet 4
    Visible Component Wear - Worn seals, corrosion, cavitation/pitting of pump components, or a loose or wobbly pump shaft are all signs of wear that may lead to water pump failure and should be addressed.
    Signs of Wear & Troubleshooting - Section 1 - Bullet 1
    Leaking Coolant - Puddles of coolant under your vehicle, a constant drip or stream of coolant from the water pump's weep hole, or a constantly empty or low coolant reservoir are all signs of potential water pump wear, and may be caused by cracks in the pump, or seal or gasket failures.
    Features & Benefits - Bullet 4
    Manufactured to GM OE specification for fit, form, and function
    Programming Required
    No
    FAQ - Answer 2
    No. Water pumps can vary greatly in size and appearance depending on the vehicle they are designed for.
    FAQ - Answer 5
    No. Your vehicle's water pump keeps coolant moving as long as the engine is running, and stops when the engine is turned off. If you want to be able to circulate coolant for a short time after the engine has been turned off, an auxiliary electric water pump is needed.
    Features & Benefits - Bullet 3
    Offering the quality, reliability, and durability of GM OE
    Signs of Wear & Troubleshooting - Section 1 - Bullet 3
    Rumbling Noise in the Pump - A rumbling, squeaking, or screeching noise near the front of your vehicle when you start it may indicate a malfunctioning water pump bearing.
    Good Maintenance Practices - Section 1 - Bullet 2
    Run your vehicle to increase engine temperature, and ensure the system is pressurized.
    Inlet Type
    Straight
    Outlet Type
    Straight
    Features & Benefits - Bullet 1
    Thoroughly tested for reliable, leak-free performance
    Good Maintenance Practices - Section 1 - Header
    Tips for Water Pump Inspection:
    FAQ - Question 1
    Will ACDelco GM Original Equipment Water Pumps, Kits and other components match the quality of my GM vehicle's original factory parts?
    FAQ - Answer 1
    Yes. ACDelco GM Original Equipment parts are equivalent to your GM vehicle's original factory components.
    FAQ - Answer 4
    Yes. As part of regular cooling system operation, the water pump sends hot coolant to the heater core of your engine, which transfers heat into the passenger cabin of your vehicle. If this hot coolant is unable to reach the heater core, then this heat transfer cannot occur, and your passenger compartment remains colder than you want.
    FAQ - Answer 3
    Yes. The water pump is responsible for moving coolant through your vehicle's cooling system, keeping the heat generated by your engine at acceptable levels, and helping prevent overheating. A malfunctioning water pump can cause your engine to overheat, which may result in severe and costly engine damage.
    Color
    Black
    Type
    Electric
    Mounting Hardware Included
    No
    Mounting Bracket Included
    Yes
    Pulley Included
    No
    Gasket Or Seal Included
    No
    Mounting Hole Quantity
    2
    Rotation
    Clockwise (Right)
    Depth
    121 mm
    Depth
    4.76 in
    Mounting Hole Diameter
    12.3 mm
    Mounting Hole Diameter
    0.48 in
    Outlet Pipe Diameter
    0.87 in
    Outlet Pipe Diameter
    22 mm
    Inlet Pipe Diameter
    0.87 in
    Inlet Pipe Diameter
    22 mm

    Features

    • Designed to deliver trouble-free, consistent performance
    • Right for your vehicle and lifestyle
    • Made from high-quality materials for ultimate durability
    • Manufactured to meet or exceed strict quality requirements

    Product Details

    GM Original Equipment™ Engine Coolant Auxiliary Water Pump (251-818) by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed stringent industry standards.

    Installation

    ACDelco® - GM Water Pump InstallationACDelco® - GM Water Pump Installation

    ACDelco is here with excellent products that are available at a competitive price. The company does its utmost to provide the best possible solutions for your needs. All products by ACDelco are made with expert care and created by professionals to meet all your requirements. The company does not accept compromises when it is going about quality, so you can be sure that all products have only first-rate quality. With many years of manufacturing experience, ACDelco is the name you can trust.

    ACDelco® - Cooling System ManualACDelco® - WarrantyAdditional InformationFAQ
    Brand:
    ACDelco
    Part Number:
    251-818
    UPC:
    808709631484
    Alternate MPN:
    251818
    OE Numbers:
    84115339

    Reviews

    (8)
    Only authorized customers can leave a review on our website. We would love to know what you like or dislike about the product. Share your opinion on product quality, appearance, installation, and other characteristics.
    /5
    1-8 of 8 Reviews
    5 of 5
    Perfect Fit for My Silverado
    Purchased the recommended acdelco pump. No surprises during install, perfect fit. shipped fast. probably gonna order from them again.
    Posted by Brandon (Lincoln, NE) / February 10, 20252018 Chevy Silverado 1500
    5 of 5
    Great Product, Cost, Shipping, Installation
    I'm not a mechanic though I'm handy and have plenty of tools. After watching Atlantic British videos on YouTube I decided this is something I can do to stay in budget. After power washing oil off the area I spent the first day removing the fan clutch assembly which required a large narrow wrench (I chose to use a large crescent wrench) and removed the old water pump. Next I cleaned the area again with the power washer. Next day I installed the new pump with gasket noting which bolts came out of which position, then removed the protective plastic thread collar on water pump and reinstalled the old fan clutch assembly. The only frustration came trying to keep the gasket in place while positioning the new pump. Some gaskets come with a tacky side to stick to the pump or engine side and that makes it easier to keep it lined up. Future suggestion perhaps.
    Posted by Noel / April 12, 20242000 Land Rover Discovery
    3 of 5
    Water Pump
    I received water pump in a too large box, not packed to keep boxes from moving around. I have not installed water pump due to weather changed & too cold & wet.
    ACDelco® - Professional™ Engine Coolant Water Pump
    Posted by Todd (Toledo, OH) / November 15, 20191973 Buick Riviera
    4 of 5
    Quality Pump
    Arrived on time. Pretty easy to install on 08 Xterra with no issues.
    Posted by Terrance (Oklahoma City, OK) / April 06, 20182008 Nissan Xterra
    5 of 5
    Water Pump
    Nice water pump and cost much less than local parts store! Works great!
    Posted by Lloyd (Atascadero, CA) / October 21, 2017
    5 of 5
    Loved My Service.
    The part was in a padded box tightly secured and everything was perfect. It was a new part with all the seals included. It was very easy to install and is working like a champ. Now all my male friends come to me to get their parts online for the great prices and great quality parts.
    ACDelco® - Professional™ Engine Coolant Water Pump
    Posted by Pauline (New Orleans, LA) / October 17, 20172003 Kia Rio
    5 of 5
    Perfect Fit
    On time and fit perfect. Easy ordering.
    Posted by Rodney (Jonesboro, GA) / September 23, 20171994 Chevy S-10 Pickup
    5 of 5
    Purchased For My Boyfriend
    This was a replacement part as the original started to leak after 100k miles. It was fairly east to install ourselves and had no surprises that came along with it (wrong part or just didn't fit right).
    Posted by Theresa (Central Square, NY) / April 13, 20172002 Chevy Tahoe

    Questions and Answers

    (0)
    If you have any questions about this product, please don't hesitate to ask us. We will be happy to help you!