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Vehicle Info NeededACDELCOPART NUMBER: 065-251-818
PUMP ASM-AUX WA (SLP-1)
$8599
Ships on 09/11/2026
Lowest Price GuaranteePart TypeAuxiliary Water Pump
BrandACDELCO
Outlet Outside Diameter (Mm)20
Housing MaterialPlastic
Sensor IncludedNo
Mounting Hole Quantity2
Outlet Quantity1
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 - Bullet 8With the new pump installed, turn the hub by hand and check for rotation.
Inlet TypeStraight
Inlet Outside Diameter (In)0.79
Good Maintenance Practices - Section 1 - Bullet 1Clean all excess dirt and debris from the water pump housing.
Outlet Pipe Diameter0.87
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 3 - HeaderTips for Water Pump Servicing & Installation:
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.
Voltage (Vdc)12
Inlet Quantity1
Product DescriptionGM Genuine Parts Engine Auxiliary Water Pumps are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These water pumps are 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. 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). ⚠<b> WARNING:</b> Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Pulley IncludedNo
Gasket Or Seal IncludedNo
ColorBlack
Inlet Pipe Diameter22
Outlet TypeStraight
Electrical Connector Quantity1
Programming RequiredNo
Hardware IncludedNo
Outlet Inside Diameter (In)0.69
Signs Of Wear &#38; 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 &#38; Troubleshooting - Section 1 - HeaderSigns of wear for engine water pump seals include but are not limited to:
Inlet Inside Diameter (Mm)17.23
Depth121
Mounting Bracket IncludedYes
Mounting Hole Diameter0.48
Outlet Inside Diameter (Mm)17.65
Features &#38; Benefits - Bullet 2Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
Features &#38; Benefits - Bullet 3GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
Features &#38; Benefits - Bullet 4GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
Features &#38; Benefits - Bullet 5GM regularly updates production and service part designs to integrate new materials and technologies
Features &#38; Benefits - Bullet 1Thoroughly tested for leak-resistant performance
Inlet Inside Diameter (In)0.68
Outlet Outside Diameter (In)0.79
Bracket IncludedYes
Good Maintenance Practices - Section 1 - HeaderTips for Water Pump Inspection:
Mounting Hardware IncludedNo
MaterialPlastic
RotationClockwise (Right)
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 4Clean all sealing surfaces, and make sure all old gasket material is removed before installing your replacement component.
TypeElectric
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 6Torque all bolts according to the manufacturer's specifications and adjust belts to proper tension (if applicable) to manufacturer's specifications.
Signs Of Wear &#38; 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.
Good Maintenance Practices - Section 3 - Bullet 1Clean and reinstall the coolant recovery reservoir before flushing the cooling system.
Signs Of Wear &#38; 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.
Inlet Outside Diameter (Mm)20
Signs Of Wear &#38; 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.
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 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 10Inspect related components in the cooling system, including your fan blades, fan clutch, engine mounts, radiator, belts and hoses, and reservoir.
Grade TypeOE
Vendor Part Number251-818
Package Qty1
Package TypeEA
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