GM Genuine Parts Water Pump Gasket
OE
Pack of 1

GM Genuine Parts Water Pump Gasket

GM Part #12630223

ACDelco Part #251-663

MSRP$13.37*

Requires 2 per engine; For LS1, LS2, LS3, LS6, LS7 and L92 engines ⚠ WARNING: Cancer and Reproductive Harm - www.

  • May be made from fiber or a rubberized composite material
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors

Pack of 1

About this product

Requires 2 per engine; For LS1, LS2, LS3, LS6, LS7 and L92 engines

Warning WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

  • May be made from fiber or a rubberized composite material
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies

Product Specifications

Thickness0.063 in / 1.62 mm
ClassificationOE

24 Months/Unlimited Miles Limited Warranty for Parts (plus Labor if installed by a GM dealer)

Please visit our warranty page on Gmparts.com for full warranty details.

Tips for Water Pump Servicing & Installation:

  • Clean all excess dirt and debris from the water pump housing.
  • Run your vehicle to increase engine temperature, and ensure the system is pressurized.
  • Inspect for leakage at the water pump outlet housing or the rear cover gasket, and leakage at the water pump vent or weep hole.
  • 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.
  • Clean and reinstall the coolant recovery reservoir before flushing the cooling system.
  • 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.
  • Do not use any non-approved flush agents and replace the coolant according to manufacturer's specifications.
  • Clean all sealing surfaces, and make sure all old gasket material is removed before installing your replacement component.
  • Never strike the water pump shaft, since this will damage the new water pump.
  • Torque all bolts according to the manufacturer's specifications and adjust belts to proper tension (if applicable) to manufacturer's specifications.
  • Use sealant tabs only if recommended. Some sealant tabs or similar compounds may restrict coolant flow through the passages of some cooling systems.
  • With the new pump installed, turn the hub by hand and check for rotation.
  • After installation, pressure-test the system for leaks and check for sufficient fan blade clearance between the blade and radiator shroud.
  • Inspect related components in the cooling system, including your fan blades, fan clutch, engine mounts, radiator, belts and hoses, and reservoir.

Signs of wear for engine water pump seals include but are not limited to:

  • 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.
  • 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.
  • 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.
  • 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.

ModelBody StyleTrimYear(s)
Avalanche2007, 2008, 2009, 2010, 2011, 2012, 2013
Avalanche 15002002, 2003, 2004, 2005, 2006
CamaroSS, ZL11999, 2000, 2001, 2002, 2010, 2011, 2012, 2013, 2014, 2015
Caprice2011, 2012, 2013, 2014, 2015, 2016, 2017
Colorado2009, 2010, 2011, 2012

Frequently Asked Questions

Yes. Always consult the Vehicle Owner’s manual or an expert technician before making any repairs or adjustments

Yes. ACDelco GM Original Equipment parts are equivalent to your GM vehicle's original factory components.

No. Water pumps can vary greatly in size and appearance depending on the vehicle they are designed for.

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.

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.

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.