ACDelco® 12643779 - GM Original Equipment™ Engine Coolant Water Pump O-Ring

8 reviews|Item # mpn5180011771
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    $4.54
    In Stock (3) - Ships Tomorrow 06.19.26
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    Vehicle Fitment

    Chevy
    GMC

    Specifications

    Maximum Diameter
    0.00 in
    Thickness
    0.12 in
    Thickness
    3.1 mm
    Minimum Diameter
    3.91 in
    Minimum Diameter
    99.4 mm
    Good Maintenance Practices - Section 2 - 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.
    Good Maintenance Practices - Section 3 - Bullet 9
    After installation, pressure-test the system for leaks and check for sufficient fan blade clearance between the blade and radiator shroud.
    Good Maintenance Practices - Section 1 - Header
    Before purchasing and installing an engine water pump housing gasket, make sure it is the correct fit for your vehicle.
    Color
    Black
    FAQ - Question 4
    Can a malfunctioning water pump harm my engine?
    Good Maintenance Practices - Section 2 - Bullet 1
    Clean all excess dirt and debris from the water pump housing.
    Good Maintenance Practices - Section 3 - Bullet 4
    Clean all sealing surfaces, and make sure all old gasket material is removed before installing your replacement component.
    Good Maintenance Practices - Section 3 - Bullet 1
    Clean and reinstall the coolant recovery reservoir before flushing the cooling system.
    FAQ - Question 3
    Do all water pumps look the same?
    Good Maintenance Practices - Section 3 - Bullet 3
    Do not use any non-approved flush agents and replace the coolant according to manufacturer's specifications.
    FAQ - Question 5
    Does the water pump affect the temperature inside the passenger compartment of my vehicle?
    FAQ - Question 6
    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.
    Good Maintenance Practices - Section 3 - Bullet 2
    Flush the cooling system completely, using power flush equipment or thermal cycling the system with clean water three times. The most effective method of system flushing is to use a coolant exchanger, following the manufacturer's operating instructions.
    Features & Benefits - Bullet 4
    GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
    Features & Benefits - Bullet 3
    GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
    Product Description
    GM Genuine Parts Engine Water Pump O-Rings are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These o-rings are used in some applications instead of paper or composite gaskets to seal the water pump housing. The interface between components will have a machined groove to accept the O-ring. The O-ring is slightly compressed when assembled to provide a liquid-tight seal, keeping engine coolant in and air and dirt out. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE). ⚠ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
    Features & Benefits - Bullet 5
    GM regularly updates production and service part designs to integrate new materials and technologies
    Good Maintenance Practices - Section 2 - 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.
    Good Maintenance Practices - Section 3 - Bullet 10
    Inspect related components in the cooling system, including your fan blades, fan clutch, engine mounts, radiator, belts and hoses, and reservoir.
    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 1
    Made from some heat and chemical-resistant materials
    Good Maintenance Practices - Section 3 - Bullet 5
    Never strike the water pump shaft, since this will damage the new water pump.
    Programming Required
    No
    FAQ - Answer 3
    No. Water pumps can vary greatly in size and appearance depending on the vehicle they are designed for.
    FAQ - Answer 6
    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.
    Rim Shape
    Round
    Material
    Rubber
    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 2 - Bullet 2
    Run your vehicle to increase engine temperature, and ensure the system is pressurized.
    FAQ - Question 1
    Should the Vehicle Owner’s manual or an expert technician be consulted before making any repairs or adjustments?
    Signs of Wear & Troubleshooting - Section 1 - Header
    Signs of wear for engine water pump seals include but are not limited to:
    Features & Benefits - Bullet 2
    Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
    Good Maintenance Practices - Section 2 - Header
    Tips for Water Pump Inspection:
    Good Maintenance Practices - Section 3 - Header
    Tips for Water Pump Servicing & Installation:
    Good Maintenance Practices - Section 3 - Bullet 6
    Torque all bolts according to the manufacturer's specifications and adjust belts to proper tension (if applicable) to manufacturer's specifications.
    Good Maintenance Practices - Section 3 - Bullet 7
    Use sealant tabs only if recommended. Some sealant tabs or similar compounds may restrict coolant flow through the passages of some cooling systems.
    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.
    FAQ - Question 2
    Will ACDelco GM Original Equipment Water Pumps, Kits and other components match the quality of my GM vehicle's original factory parts?
    Good Maintenance Practices - Section 3 - Bullet 8
    With the new pump installed, turn the hub by hand and check for rotation.
    FAQ - Answer 2
    Yes. ACDelco GM Original Equipment parts are equivalent to your GM vehicle's original factory components.
    FAQ - Answer 1
    Yes. Always consult the Vehicle Owner’s manual or an expert technician before making any repairs or adjustments
    FAQ - Answer 5
    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 4
    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.

    Features

    • Completely pressure-tested for leak-free performance.
    • High-quality bearings and heat-treated impellers for long life.
    • Designed for smooth flow of coolant for superior protection.

    Product Details

    GM Original Equipment™ Engine Coolant Water Pump O-Ring by ACDelco®. Coolant flow is crucial for the life of any engine. GM Original Equipment™ Water Pumps are the best way to make sure you have the proper heat protection for the engine in your car, truck or SUV. Built to meet the latest manufacturer-specified designs, GM OE Water Pumps, in both cast-iron and aluminum, are thoroughly leak-tested, and feature uniform wall sections and smooth coolant-flow cavities for efficient operation and remarkable engine protection. High-quality bearings, heat-treated impellers and coated seals mean long life and trouble-free ownership. Trust ACDelco to protect your vehicle’s vital systems.

    Installation

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

    The cooling system of your automobile is vital to your engine's overall health and longevity. That is why it’s critical to replace leaking, malfunctioning, cracked or otherwise damaged cooling parts and components in time. Without proper cooling, your engine can crack and seize up, which can lead to engine damage. To save your energy, time and money, get the superior OEM parts they offer for your vehicle. Each product is made from high quality materials to maintain proper cooling of your engine and prevent overheating.

    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:
    12643779
    UPC:
    197224993888

    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!