ACDelco Gold Engine Water Pump

About this product

"ACDelco Gold Engine Water Pumps are a high quality alternative to Original Equipment (OE) parts. When your temperature gauge starts creeping up, you spot coolant on the driveway, or you hear a whining noise near the front pulley, a worn water pump is often the culprit. These engine water pumps are driven by the serpentine belt to circulate coolant through the engine block and radiator, working with the thermostat to keep operating temperatures steady in stop-and-go traffic, long highway commutes, and hot summer conditions. By moving fluid continuously, they help prevent sudden overheating, reduce heat-soak stress when towing heavier loads, and protect the engine from costly heat damage that can leave you stranded. Built with durable sealing surfaces and bearing support for smooth rotation, it's designed and validated for leak-resistant, consistent cooling performance you can count on day after day. ACDelco Gold parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors."

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

Delivers consistent cooling for peace of mind on the road
Maintains proper operating temperatures by moving fluid continuously
Provides necessary cooling capacity when towing heavy loads
Driven by the serpentine belt to keep the cooling system active
Protects your engine from costly heat damage
An essential link in the vehicle thermal management network
Thoroughly tested for leak-resistant performance
Premium aftermarket replacement part
"Quality, performance, and dependability of ACDelco Gold parts are validated through an extensive testing regimen"
"Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models"

Includes Back HousingNo

Pulley IncludedNo

Fan Clutch IncludedNo

Outlet Quantity2

Mounting Hardware IncludedNo

Hub Hole Quantity4

Mounting Hole Quantity4

ClassificationGold

Housing MaterialGrey Iron

Impeller MaterialSteel

Water Pump Drive TypeTiming belt

Hub Height6.925 in / 175.76 mm

Casting Number81-18308C

Impeller Vane Quantity6

Impeller RotationStandard

Thermostat And Housing IncludedNo

Installation WarningsNo

Includes Back HousingNo

Fan Clutch IncludedNo

Mounting Hardware IncludedNo

Mounting Hole Quantity4

Housing MaterialGrey Iron

Water Pump Drive TypeTiming belt

Casting Number81-18308C

Impeller RotationStandard

Installation WarningsNo

Pulley IncludedNo

Outlet Quantity2

Hub Hole Quantity4

ClassificationGold

Impeller MaterialSteel

Hub Height6.925 in / 175.76 mm

Impeller Vane Quantity6

Thermostat And Housing IncludedNo

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 to Help Prevent Water Pump Failure:

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.
Determine the root cause of failure, particularly if the water pump failed prematurely.
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 water 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.
Flush 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.
Utilize 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.
Never overtighten your drive belts. Belts that are too tight may cause an overload on pump bearings, greatly reducing the life of the water pump.
Inspect 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.
Ensure 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.
Inspect the thermostat and radiator cap. Examine your thermostat and radiator cap, and replace if they show signs of sticking or leaking.

Troubleshooting Tips:

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 pump failure, and should be addressed.

Model	Trim	Year(s)
Astro	Base, CL, CS	1985, 1986
Blazer	Custom Deluxe, Scottsdale, Silverado	1987, 1988
C10	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado, Big Ten	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
C10 Suburban	Custom, Deluxe, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
C20	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
C20 Suburban	Custom, Deluxe, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
C30	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
Camaro	Base, Sport, LT, Berlinetta, Iroc-Z, LT Rally Sport, Rally Sport, Z28, Z28 Indianapolis 500 Pace Car	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
Caprice	Base, Classic, Classic Estate, Classic Landau, Classic Brougham, Classic Sport, Classic LS Brougham	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988
El Camino	Base, Classic, Conquista, Royal Knight, SS	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
G10	Base, Beauville, Bonaventure, Chevy Van, Sportvan	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
G10 Van	Base	1972
G20	Beauville, Bonaventure, Chevy Van, Sportvan	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
G30	Beauville, Bonaventure, Chevy Van, Sportvan, Hi-Cube	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988
Impala	Base, Custom, Sport, Landau, Estate	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985
K10	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
K10 Suburban	Custom, Deluxe, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
K20	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
K20 Suburban	Custom, Deluxe, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
K30	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
K5 Blazer	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
Malibu	Base, Sport, Landau, Classic, Estate, Classic Estate, Classic Landau, Classic Sport, Police	1978, 1979, 1980, 1981, 1982, 1983
Monte Carlo	S, Base, LS, Sport, Landau, CL, SS	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988
Nova	Base, Custom, Concours, Police, Rally	1977, 1978, 1979
P10	Base, Step-Van	1977, 1978
P20	Base, Step-Van	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989
P30	Base, Step-Van	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
R10	Custom Deluxe, Scottsdale, Silverado	1987
R10 Suburban	Custom Deluxe, Scottsdale, Silverado	1987, 1988
R20	Cheyenne, Custom Deluxe, Scottsdale, Silverado	1987, 1988
R20 Suburban	Custom Deluxe, Scottsdale, Silverado	1987, 1988
R2500	Silverado	1989
R30	Cheyenne, Custom Deluxe, Scottsdale, Silverado	1987, 1988
R3500	Cheyenne, Scottsdale, Silverado	1989, 1990, 1991
V10	Custom Deluxe, Scottsdale, Silverado	1987
V10 Suburban	Custom Deluxe, Scottsdale, Silverado	1987, 1988
V20	Custom Deluxe, Scottsdale, Silverado	1987
V20 Suburban	Custom Deluxe, Scottsdale, Silverado	1987, 1988
V30	Cheyenne, Custom Deluxe, Scottsdale, Silverado	1987, 1988
V3500	Cheyenne, Scottsdale, Silverado	1989, 1990, 1991

About this product

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

Delivers consistent cooling for peace of mind on the road
Maintains proper operating temperatures by moving fluid continuously
Provides necessary cooling capacity when towing heavy loads
Driven by the serpentine belt to keep the cooling system active
Protects your engine from costly heat damage
An essential link in the vehicle thermal management network
Thoroughly tested for leak-resistant performance
Premium aftermarket replacement part
"Quality, performance, and dependability of ACDelco Gold parts are validated through an extensive testing regimen"
"Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models"

Includes Back HousingNo

Pulley IncludedNo

Fan Clutch IncludedNo

Outlet Quantity2

Mounting Hardware IncludedNo

Hub Hole Quantity4

Mounting Hole Quantity4

ClassificationGold

Housing MaterialGrey Iron

Impeller MaterialSteel

Water Pump Drive TypeTiming belt

Hub Height6.925 in / 175.76 mm

Casting Number81-18308C

Impeller Vane Quantity6

Impeller RotationStandard

Thermostat And Housing IncludedNo

Installation WarningsNo

Includes Back HousingNo

Fan Clutch IncludedNo

Mounting Hardware IncludedNo

Mounting Hole Quantity4

Housing MaterialGrey Iron

Water Pump Drive TypeTiming belt

Casting Number81-18308C

Impeller RotationStandard

Installation WarningsNo

Pulley IncludedNo

Outlet Quantity2

Hub Hole Quantity4

ClassificationGold

Impeller MaterialSteel

Hub Height6.925 in / 175.76 mm

Impeller Vane Quantity6

Thermostat And Housing IncludedNo

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 to Help Prevent Water Pump Failure:

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.
Determine the root cause of failure, particularly if the water pump failed prematurely.
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 water 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.
Flush 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.
Utilize 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.
Never overtighten your drive belts. Belts that are too tight may cause an overload on pump bearings, greatly reducing the life of the water pump.
Inspect 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.
Ensure 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.
Inspect the thermostat and radiator cap. Examine your thermostat and radiator cap, and replace if they show signs of sticking or leaking.

Troubleshooting Tips:

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 pump failure, and should be addressed.

Model	Trim	Year(s)
Astro	Base, CL, CS	1985, 1986
Blazer	Custom Deluxe, Scottsdale, Silverado	1987, 1988
C10	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado, Big Ten	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
C10 Suburban	Custom, Deluxe, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
C20	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
C20 Suburban	Custom, Deluxe, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
C30	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
Camaro	Base, Sport, LT, Berlinetta, Iroc-Z, LT Rally Sport, Rally Sport, Z28, Z28 Indianapolis 500 Pace Car	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
Caprice	Base, Classic, Classic Estate, Classic Landau, Classic Brougham, Classic Sport, Classic LS Brougham	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988
El Camino	Base, Classic, Conquista, Royal Knight, SS	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
G10	Base, Beauville, Bonaventure, Chevy Van, Sportvan	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
G10 Van	Base	1972
G20	Beauville, Bonaventure, Chevy Van, Sportvan	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
G30	Beauville, Bonaventure, Chevy Van, Sportvan, Hi-Cube	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988
Impala	Base, Custom, Sport, Landau, Estate	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985
K10	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
K10 Suburban	Custom, Deluxe, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
K20	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
K20 Suburban	Custom, Deluxe, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
K30	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
K5 Blazer	Custom, Deluxe, Cheyenne, Custom Deluxe, Scottsdale, Silverado	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
Malibu	Base, Sport, Landau, Classic, Estate, Classic Estate, Classic Landau, Classic Sport, Police	1978, 1979, 1980, 1981, 1982, 1983
Monte Carlo	S, Base, LS, Sport, Landau, CL, SS	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988
Nova	Base, Custom, Concours, Police, Rally	1977, 1978, 1979
P10	Base, Step-Van	1977, 1978
P20	Base, Step-Van	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989
P30	Base, Step-Van	1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
R10	Custom Deluxe, Scottsdale, Silverado	1987
R10 Suburban	Custom Deluxe, Scottsdale, Silverado	1987, 1988
R20	Cheyenne, Custom Deluxe, Scottsdale, Silverado	1987, 1988
R20 Suburban	Custom Deluxe, Scottsdale, Silverado	1987, 1988
R2500	Silverado	1989
R30	Cheyenne, Custom Deluxe, Scottsdale, Silverado	1987, 1988
R3500	Cheyenne, Scottsdale, Silverado	1989, 1990, 1991
V10	Custom Deluxe, Scottsdale, Silverado	1987
V10 Suburban	Custom Deluxe, Scottsdale, Silverado	1987, 1988
V20	Custom Deluxe, Scottsdale, Silverado	1987
V20 Suburban	Custom Deluxe, Scottsdale, Silverado	1987, 1988
V30	Cheyenne, Custom Deluxe, Scottsdale, Silverado	1987, 1988
V3500	Cheyenne, Scottsdale, Silverado	1989, 1990, 1991

Frequently Asked Questions

Yes. ACDelco Professional Water Pump Kits and Water Pumps are for both GM and non-GM vehicle applications.

Yes. ACDelco Professional Water Pump Kits and Water Pumps are packaged with the gaskets, seals, and O-rings needed for installation.

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.

About this product

Product details

Specifications

Warranty

Maintenance

Tips to Help Prevent Water Pump Failure:

Troubleshooting Tips:

Fits these vehicles

About this product

Product details

Specifications

Warranty

Maintenance

Tips to Help Prevent Water Pump Failure:

Troubleshooting Tips:

Fits these vehicles

Frequently Asked Questions

Can I use ACDelco Professional Water Pump Kits and Water Pumps on my non-GM vehicle?

Do ACDelco Professional Water Pump Kits and Water Pumps come with installation components?

Do all water pumps look the same?

Can a malfunctioning water pump harm my engine?

Does the water pump affect the temperature inside the passenger compartment of my vehicle?

Does the water pump work when my vehicle is turned off?

ACDelco Gold Engine Water Pump

ACDelco Gold Engine Water Pump