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ACDelco 251-840 - Engine Water Pump
- BrandACDelco
- ManufacturerACDelco
- MPN251-840
- FeaturesFAQ - Answer 1 : Yes. Always consult the Vehicle Owner's manual or an expert technician before making any repairs or adjustments
FAQ - Answer 2 : Yes. ACDelco GM Original Equipment parts are equivalent to your GM vehicle's original factory components.
FAQ - Answer 3 : No. Water pumps can vary greatly in size and appearance depending on the vehicle they are designed for.
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.
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 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.
FAQ - Question 1 : Should the Vehicle Owner's manual or an expert technician be consulted before making any repairs or adjustments?
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?
FAQ - Question 3 : Do all water pumps look the same?
FAQ - Question 4 : Can a malfunctioning water pump harm my engine?
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?
Features & Benefits - Bullet 1 : Thoroughly tested for reliable, leak-resistant performance
Features & Benefits - Bullet 2 : Uniform wall sections and smooth coolant-flow cavities for efficient operation
Features & Benefits - Bullet 3 : Coated seals with a stainless steel spring for durability
Features & Benefits - Bullet 4 : GM-recommended replacement part for your GM vehicle's original factory component
Features & Benefits - Bullet 5 : Offering the quality, reliability, and durability of GM OE
Features & Benefits - Bullet 6 : Manufactured to GM OE specification for fit, form, and function
Good Maintenance Practices - Section 1 - Header : Before purchasing and installing an engine water pump, make sure it is the correct fit for your vehicle.
Good Maintenance Practices - Section 2 - Bullet 1 : Clean all excess dirt and debris from the water pump housing.
Good Maintenance Practices - Section 2 - Bullet 2 : Run your vehicle to increase engine temperature, and ensure the system is pressurized.
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 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 2 - Header : Tips for Water Pump Inspection:
Good Maintenance Practices - Section 3 - Bullet 1 : Clean and reinstall the coolant recovery reservoir before flushing the cooling system.
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.
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.
Good Maintenance Practices - Section 3 - Bullet 3 : Do not use any non-approved flush agents and replace the coolant according to manufacturer's specifications.
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 5 : Never strike the water pump shaft, since this will damage the new water pump.
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.
Good Maintenance Practices - Section 3 - Bullet 8 : With the new pump installed, turn the hub by hand and check for rotation.
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 3 - Header : Tips for Water Pump Servicing & Installation:
Height (in) : 8.38
Length (in) : 10.12
Product Description : An ACDelco GM Original Equipment Engine Water Pump circulates coolant through your vehicle's radiator and engine system to help maintain proper engine temperature and performance. This original equipment water pump has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors. âš WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov
Programming Required : No
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.
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 - 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.
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 - Header : Signs of wear for heater water pumps include but are not limited to:
Weight (lb) : 5.53
Width (in) : 9.38 - EAN00808709859628
- Cross Reference Numbers251840
- Part TypeEngine Water Pump
- Fitment
- Fitment TypeVehicle Specific
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 2019 | Cadillac | CT6 | Premium Luxury (2.0 L4 GAS) | Engine: LSY, VIN: K, Transmission Type: Transmission, Speed: 10, Transmission Control: Automatic, Transmission Code: 10L80, Notes: TIER 3 FEDERAL EMISSION SYSTEM(NTB), ULEV50 CALIFORNIA EMISSIONS(NUC), ULEV50 KOREAN EMISSION SYSTEM(NUP) |
| 2019 | Cadillac | CT6 | Luxury (2.0 L4 GAS) | Engine: LSY, VIN: K, Transmission Type: Transmission, Speed: 10, Transmission Control: Automatic, Transmission Code: 10L80, Notes: TIER 3 FEDERAL EMISSION SYSTEM(NTB), ULEV50 CALIFORNIA EMISSIONS(NUC), ULEV50 KOREAN EMISSION SYSTEM(NUP) |
| 2020 | Cadillac | CT5 | Luxury (2.0 L4 GAS) | Engine: LSY, VIN: K, Transmission Type: Transmission, Speed: 10, Transmission Control: Automatic, Transmission Code: 10L80 |
| 2020 | Cadillac | CT5 | Sport (2.0 L4 GAS) | Engine: LSY, VIN: K, Transmission Type: Transmission, Speed: 10, Transmission Control: Automatic, Transmission Code: 10L80 |
| 2020 | Cadillac | CT5 | Premium Luxury (2.0 L4 GAS) | Engine: LSY, VIN: K, Transmission Type: Transmission, Speed: 10, Transmission Control: Automatic, Transmission Code: 10L80 |
| 2020 | Cadillac | CT4 | Sport (2.0 L4 GAS) | Engine: LSY, VIN: K, Transmission Type: Transmission, Speed: 8, Transmission Control: Automatic, Transmission Code: 8L45 |
| 2020 | Cadillac | CT4 | Premium Luxury (2.0 L4 GAS) | Engine: LSY, VIN: K, Transmission Type: Transmission, Speed: 8, Transmission Control: Automatic, Transmission Code: 8L45 |
| 2020 | Cadillac | CT4 | Luxury (2.0 L4 GAS) | Engine: LSY, VIN: K, Transmission Type: Transmission, Speed: 8, Transmission Control: Automatic, Transmission Code: 8L45 |
Warranty Overview
At Newparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.
Standard Warranty – Most Parts
Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.
Protection: Defects in materials or workmanship under normal personal use.
Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.
Exclusions:
Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)
Commercial, fleet, rideshare, off-road, or racing use
Improper installation, misuse, accidents, or modifications
Not Covered: Labor, shipping, towing, or incidental costs.
Bison Performance Warranty – Our House Brand
Coverage: Limited Lifetime Warranty for as long as you own your vehicle.
Applies To: All products sold under the Bison Performance label.
Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.
Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).
What’s Included: Replacement of the defective product (labor and shipping excluded).
Warranty Claim Requirements
To keep claims fast and fair, we require:
Proof of purchase (invoice or order confirmation).
Photos or videos showing the defective part, order number, date, VIN, and odometer reading.
Diagnostic reports or part returns for non-visible issues may be requested.
Claims must be truthful, properly documented, and reflect normal consumer use.
Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.
For full details and exclusions, please see our complete Warranty Terms & Conditions.
This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.
Return Policy Overview
Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
To start a return, use our Return Portal or contact support.
Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)
Refunds: Issued to your original payment method within 3–5 business days after inspection
Exchanges: Not automatic — please return and reorder
Replacements: May be approved for incorrect or defective items reported within 7 days
Not returnable:
Used or installed parts
Electrical components
Opened filter kits, gaskets, or contaminated items
Final sale or custom orders
Important Notes:
Return shipping is your responsibility unless we made a verified error
Fitment is the customer’s responsibility (we can assist, but do not guarantee)
Country of origin may vary and is not grounds for return
For complete details, please see our full Return Policy.
This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.
Fast, Reliable Shipping — Straight to Your Door
We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.
We use trusted carriers like UPS, FedEx, and USPS.
Tracking info is emailed to you as soon as your order ships.
Delivery estimates at checkout are based on carrier data, but not guaranteed.
Need help with a shipment?
If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.
For full details, please see our complete Shipping Policy.
This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.
