ACDelco 251-748 Engine Water Pump

Part Number
251-748
Engine Water Pump

Fits: 06-16 Chevrolet Express 2500, 06-16 Chevrolet Express 3500, 06-16 Chevrolet Silverado 2500 HD, 06 Chevrolet Silverado 3500, 06-16 GMC Savana 2500, 06-16 GMC Savana 3500, 06-16 GMC Sierra 2500 HD, 06 GMC Sierra 3500, 07 Chevrolet Silverado 2500 HD Classic, 07 Chevrolet Silverado 3500 Classic, 07-16 Chevrolet Silverado 3500 HD, 07 GMC Sierra 2500 HD Classic, 07 GMC Sierra 3500 Classic, 07-16 GMC Sierra 3500 HD, 09-16 Chevrolet Express 4500, 09-16 GMC Savana 4500

$206.99
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Estimated Ship Date: 1 Business Day or Less
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 - https://www.P65Warnings.ca.gov


BRAND: ACDelco




FEATURES:


  • Chevrolet;Chevrolet;GMC;GMC
  • Coated seals with a stainless steel spring for durability
  • GM-recommended replacement part for your GM vehicle's original factory component
  • Manufactured to GM OE specification for fit, form, and function
  • Offering the quality, reliability, and durability of GM OE
  • Thoroughly tested for reliable, leak-resistant performance
  • Uniform wall sections and smooth coolant-flow cavities for efficient operation


SPECIFICS:


Fan Clutch IncludedNo
FAQ - Answer 1Yes. Always consult the Vehicle Owner's manual or an expert technician before making any repairs or adjustments
FAQ - Answer 2Yes. ACDelco GM Original Equipment parts are equivalent to your GM vehicle's original factory components.
FAQ - Answer 3No. Water pumps can vary greatly in size and appearance depending on the vehicle they are designed for.
FAQ - Answer 4Yes. 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 5Yes. 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 6No. 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 1Should the Vehicle Owner's manual or an expert technician be consulted before making any repairs or adjustments?
FAQ - Question 2Will ACDelco GM Original Equipment Water Pumps, Kits and other components match the quality of my GM vehicle's original factory parts?
FAQ - Question 3Do all water pumps look the same?
FAQ - Question 4Can a malfunctioning water pump harm my engine?
FAQ - Question 5Does the water pump affect the temperature inside the passenger compartment of my vehicle?
FAQ - Question 6Does the water pump work when my vehicle is turned off?
Good Maintenance Practices - Section 1 - HeaderBefore purchasing and installing an engine water pump, make sure it is the correct fit for your vehicle.
Good Maintenance Practices - Section 2 - Bullet 1Clean all excess dirt and debris from the water pump housing.
Good Maintenance Practices - Section 2 - Bullet 2Run your vehicle to increase engine temperature, and ensure the system is pressurized.
Good Maintenance Practices - Section 2 - 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 2 - 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 2 - HeaderTips for Water Pump Inspection:
Good Maintenance Practices - Section 3 - Bullet 1Clean and reinstall the coolant recovery reservoir before flushing the cooling system.
Good Maintenance Practices - Section 3 - 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 3 - 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 3 - Bullet 3Do not use any non-approved flush agents and replace the coolant according to manufacturer's specifications.
Good Maintenance Practices - Section 3 - Bullet 4Clean all sealing surfaces, and make sure all old gasket material is removed before installing your replacement component.
Good Maintenance Practices - Section 3 - Bullet 5Never strike the water pump shaft, since this will damage the new water pump.
Good Maintenance Practices - Section 3 - 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 3 - 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 3 - Bullet 8With the new pump installed, turn the hub by hand and check for rotation.
Good Maintenance Practices - Section 3 - 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 3 - HeaderTips for Water Pump Servicing & Installation:
Height (in)6.1
Housing MaterialAluminum
Impeller MaterialSteel
Impeller RotationStandard
Includes Back HousingNo
Includes Thermostat and HousingNo
Installation WarningsNo
Length (in)9
Mounting Hardware IncludedNo
Mounting Hole Quantity6
Outlet Quantity1
Programming RequiredNo
Pulley IncludedNo
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.
Signs of Wear & Troubleshooting - Section 1 - HeaderSigns of wear for heater water pumps include but are not limited to:
Thermostat And Housing IncludedNo
Water Pump Drive TypeGear
Weight (lb)7.61
Width (in)7.7

GASKET NOT INCLUDED


DOWNLOADS:




APPLICATIONS:


  • 2009-2016 Chevrolet Express 4500
  • 2006-2006 Chevrolet Silverado 3500
  • 2006-2016 Chevrolet Express 2500
  • 2007-2016 GMC Sierra 3500 HD
  • 2006-2016 GMC Savana 2500
  • 2006-2006 GMC Sierra 3500
  • 2007-2016 Chevrolet Silverado 3500 HD
  • 2006-2016 Chevrolet Silverado 2500 HD
  • 2007-2007 GMC Sierra 3500 Classic
  • 2006-2016 GMC Sierra 2500 HD
  • 2007-2007 Chevrolet Silverado 2500 HD Classic
  • 2007-2007 GMC Sierra 2500 HD Classic
  • 2006-2016 GMC Savana 3500
  • 2006-2016 Chevrolet Express 3500
  • 2007-2007 Chevrolet Silverado 3500 Classic
  • 2009-2016 GMC Savana 4500
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