ACDelco 251-719 Engine Water Pump

Part Number
Engine Water Pump

Fits: Cadillac Escalade, Chevrolet Astro, Chevrolet Blazer, Chevrolet C1500, Chevrolet C1500 Suburban, Chevrolet C2500, Chevrolet C2500 Suburban, Chevrolet C3500, Chevrolet Express 1500, Chevrolet Express 2500, Chevrolet Express 3500, Chevrolet K1500, Chevrolet K1500 Suburban, Chevrolet K2500, Chevrolet K2500 Suburban, Chevrolet K3500, Chevrolet P30, Chevrolet S10, Chevrolet Silverado 1500, Chevrolet Silverado 1500 Classic, Chevrolet Tahoe, GMC C1500, GMC C1500 Suburban, GMC C2500, GMC C2500 Suburban, GMC C3500, GMC Jimmy, GMC K1500, GMC K1500 Suburban, GMC K2500, GMC K2500 Suburban, GMC K3500, GMC P3500, GMC Safari, GMC Savana 1500, GMC Savana 2500, GMC Savana 3500, GMC Sierra 1500, GMC Sierra 1500 Classic, GMC Sonoma, GMC Yukon, Oldsmobile Bravada

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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. ? WARNING: Cancer and Reproductive Harm -



  • Cadillac;Chevrolet;Chevrolet;GMC;GMC;Oldsmobile
  • Coated seals with a stainless steel spring for durability
  • GM-recommended replacement part for your GM vehicle's original factory water pump
  • Heat-treated impeller shafts supported by high-quality ball/roller bearings for smooth, reliable operation in virtually all conditions
  • Manufactured to GM OE specification for fit, form, and function
  • Offering the quality, reliability, and durability of GM OE
  • Thoroughly tested for reliable, leak-free performance
  • Uniform wall sections and smooth coolant-flow cavities for efficient operation


Fan Clutch IncludedNo
FAQ - Answer 1Yes. ACDelco GM Original Equipment parts are equivalent to your GM vehicle's original factory components.
FAQ - Answer 2No. Water pumps can vary greatly in size and appearance depending on the vehicle they are designed for.
FAQ - Answer 3Yes. 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 4Yes. 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 5No. 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 1Will ACDelco GM Original Equipment Water Pumps, Kits and other components match the quality of my GM vehicle's original factory parts?
FAQ - Question 2Do all water pumps look the same?
FAQ - Question 3Can a malfunctioning water pump harm my engine?
FAQ - Question 4Does the water pump affect the temperature inside the passenger compartment of my vehicle?
FAQ - Question 5Does the water pump work when my vehicle is turned off?
Good Maintenance Practices - Section 1 - Bullet 1Clean all excess dirt and debris from the water pump housing.
Good Maintenance Practices - Section 1 - Bullet 2Run your vehicle to increase engine temperature, and ensure the system is pressurized.
Good Maintenance Practices - Section 1 - Bullet 3Inspect 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 1 - Bullet 4A 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 1 - HeaderTips for Water Pump Inspection:
Good Maintenance Practices - Section 2 - Bullet 1Clean and reinstall the coolant recovery reservoir before flushing the cooling system.
Good Maintenance Practices - Section 2 - Bullet 10Inspect related components in the cooling system, including your fan blades, fan clutch, engine mounts, radiator, belts and hoses, and reservoir.
Good Maintenance Practices - Section 2 - Bullet 2Flush 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 2 - Bullet 3Do not use any non-approved flush agents, and replace the coolant according to manufacturer's specifications.
Good Maintenance Practices - Section 2 - Bullet 4Clean all sealing surfaces, and make sure all old gasket material is removed before installing your replacement component.
Good Maintenance Practices - Section 2 - Bullet 5Never strike the water pump shaft, since this will damage the new water pump.
Good Maintenance Practices - Section 2 - Bullet 6Torque all bolts according to the manufacturer's specifications, and adjust belts to proper tension (if applicable) to manufacturer's specifications.
Good Maintenance Practices - Section 2 - Bullet 7Use 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 2 - Bullet 8With the new pump installed, turn the hub by hand and check for rotation.
Good Maintenance Practices - Section 2 - Bullet 9After installation, pressure-test the system for leaks and check for sufficient fan blade clearance between the blade and radiator shroud.
Good Maintenance Practices - Section 2 - HeaderTips for Water Pump Servicing & Installation:
Good Maintenance Practices - Section 3 - Bullet 1Flush your cooling system whenever the water pump or other system components are replaced. This will help prevent contamination from entering the system, which may result in repeated failure.
Good Maintenance Practices - Section 3 - Bullet 2Utilize quality coolant when refilling your cooling system with the recommended 50/50 coolant/water mix. Distilled water should be used, as hard tap water can leave mineral deposits in the cooling system and reduce coolant flow, or result in corrosion and seal damage. Contaminated or depleted coolant can also result in corrosion and seal damage, and lead to pump failure. Take care to select the correct coolant for your vehicle by consulting the vehicle manufacturer's service information.
Good Maintenance Practices - Section 3 - Bullet 3Never overtighten your drive belts. Belts that are too tight may cause an overload on pump bearings, greatly reducing the life of the water pump.
Good Maintenance Practices - Section 3 - Bullet 4Inspect the fan blade. If damage is not detected, bent blades, loose rivets, and cracks may result in premature bearing failure. If damage is found, do not try to repair the fan-the part should be replaced.
Good Maintenance Practices - Section 3 - Bullet 5Ensure that your engine fan pulley (or clutch, if used) is seated properly on the pump's shaft. If the fan wobbles during rotation, vibration resulting in premature bearing wear may occur. Also check the fan clutch for wear and replace as necessary.
Good Maintenance Practices - Section 3 - Bullet 6Inspect the thermostat and radiator cap. Examine your thermostat and radiator cap, and replace if they show signs of sticking or leaking.
Good Maintenance Practices - Section 3 - HeaderTips to Help Prevent Water Pump Failure:
Grade TypeRegular
Height (in)8.38
Housing MaterialCast Iron
Hub Flange Diameter (mm)84.6 mm
Hub Flange Mount Hole Quantity4
Impeller MaterialSteel
Includes Back HousingYes
Includes Thermostat and HousingNo
Length (in)13.38
Mounting Hardware IncludedNo
Outlet Port Quantity3
Programming RequiredNo
Pulley IncludedNo
Pump Mount Hole Quantity4
Related Cooling Fan ComponentsNone
Signs of Wear & Troubleshooting - Section 1 - Bullet 1Leaking 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 2Engine 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 3Rumbling 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 4Visible 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.
Timing Belt IncludedNo
Water Pump Drive TypeSerpentine Belt
Weight (lb)13.9
Width (in)8.38



  • 1996-2000 GMC K3500
    • W/GSKT
  • 1999-2000 Cadillac Escalade
    • W/GSKT
  • 1996-2002 GMC Jimmy
    • W/GSKT
  • 1996-2000 Chevrolet C2500
    • W/GSKT
  • 1996-1999 GMC C1500
    • W/GSKT
  • 2005-2005 GMC Jimmy
    • W/GSKT
  • 1996-1999 GMC K1500 Suburban
    • W/GSKT
  • 1996-1999 Chevrolet K1500
    • W/GSKT
  • 1996-1999 GMC K1500
    • W/GSKT
  • 1996-2004 Chevrolet S10
    • W/GSKT
  • 1996-2000 Chevrolet Tahoe
    • W/GSKT
  • 1996-2005 GMC Safari
    • W/GSKT
  • 1996-2000 GMC C3500
    • W/GSKT
  • 1996-2000 GMC Yukon
    • W/GSKT
  • 1996-1999 GMC P3500
    • W/GSKT
  • 1996-1999 Chevrolet C1500
    • W/GSKT
  • 1996-2000 Chevrolet K2500
    • W/GSKT
  • 2007-2007 Chevrolet Silverado 1500 Classic
    • W/GSKT
  • 1996-2005 GMC Savana 2500
    • W/GSKT
  • 1996-2014 GMC Savana 1500
    • W/GSKT
  • 1996-2014 Chevrolet Express 1500
    • W/GSKT
  • 1996-2005 Chevrolet Astro
    • W/GSKT
  • 1996-1999 Chevrolet K1500 Suburban
    • W/GSKT
  • 2007-2007 GMC Sierra 1500 Classic
    • W/GSKT
  • 2007-2013 Chevrolet Silverado 1500
  • 1996-2001 Oldsmobile Bravada
    • W/GSKT
  • 1996-2000 Chevrolet K3500
    • W/GSKT
  • 1996-2005 Chevrolet Blazer
    • W/GSKT
  • 1996-1999 Chevrolet C1500 Suburban
    • W/GSKT
  • 1996-1999 GMC C1500 Suburban
    • W/GSKT
  • 1996-1999 Chevrolet K2500 Suburban
    • W/GSKT
  • 1996-2002 GMC Savana 3500
    • W/GSKT
  • 1996-1999 Chevrolet C2500 Suburban
    • W/GSKT
  • 1996-2000 GMC K2500
    • W/GSKT
  • 1999-2006 Chevrolet Silverado 1500
    • W/GSKT
  • 1996-1999 GMC C2500 Suburban
    • W/GSKT
  • 1996-2005 Chevrolet Express 2500
    • W/GSKT
  • 1996-1999 GMC K2500 Suburban
    • W/GSKT
  • 1996-2002 Chevrolet Express 3500
    • W/GSKT
  • 1996-1999 Chevrolet P30
    • W/GSKT
  • 2007-2013 GMC Sierra 1500
  • 1996-2004 GMC Sonoma
    • W/GSKT
  • 1996-2000 Chevrolet C3500
    • W/GSKT
  • 1999-2006 GMC Sierra 1500
    • W/GSKT
  • 1996-2000 GMC C2500
    • W/GSKT
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