Fitment Warning
This pump does not fit every GM 4.8L, 5.3L, or 6.0L engine. GM changed the water-pump design, thermostat arrangement, outlet position, and belt alignment across generations.
Verify:
- VIN
- Engine code
- Model year
- Vehicle production date
- Water-pump outlet location
- Pulley alignment
- Original part number
The safest interchange reference is the original pump—not merely the displacement printed on the engine cover.
Replacement Part Numbers
The OAW G7341B is commonly associated with:
- ACDelco 252-845
- ACDelco 252-782
- GM 19195104
- GM 12445113
- GM 12569519
- GM 89018166
- Airtex AW5104
- Gates 45006
- GMB 130-7340
- 1307340AT
- 1312391
- WP-9409
GM’s official ACDelco Gold 19195104 product page identifies 252-845 as a compatible aftermarket water-pump reference for numerous GM applications.
Product Features
- OE-style fit and operating characteristics
- Compatible with selected Gen III Vortec V8 engines
- Thermostat included
- Precut gasket included
- Belt-driven mechanical design
- Manufactured to match original mounting dimensions
- Designed for normal coolant flow and pressure
- New assembly rather than a remanufactured pump
- Complete package for easier installation
How the G7341B Water Pump Works
The engine’s serpentine belt turns the pump pulley, shaft, and internal impeller. The rotating impeller circulates coolant through the:
- Engine block
- Cylinder heads
- Heater core
- Thermostat housing
- Radiator
Coolant absorbs combustion heat and carries it to the radiator. The thermostat controls flow according to coolant temperature, while the radiator and fan remove heat.
The pump moves coolant; it does not single-handedly create cooling-system pressure. That pressure develops as coolant heats and is regulated by the pressure cap.
Benefits of an Included Thermostat
Replacing the thermostat with the water pump may be worthwhile when:
- The cooling system is already drained
- The thermostat’s age is unknown
- The vehicle has overheated
- Coolant has been contaminated
- The thermostat is sticking
- The housing or gasket is leaking
- The vehicle has high mileage
A new pump cannot compensate for a thermostat stuck closed. Conversely, a new thermostat cannot stop coolant pouring from a failed pump seal. Cooling systems remain irritatingly committed to shared responsibility.
Symptoms of a Failing GM Vortec Water Pump
Possible warning signs include:
- Coolant leaking from the front of the engine
- Dried orange or white coolant residue
- Grinding or rumbling noises
- Water-pump pulley wobble
- Serpentine-belt misalignment
- Rising engine temperature
- Weak or intermittent cabin heat
- Repeated coolant loss
- Sweet coolant odor
- Steam from the engine compartment
These symptoms can also result from a leaking hose, radiator, thermostat housing, heater fitting, expansion tank, or pressure cap.
Use our guide explaining how to find a coolant leak before replacing parts. Our comparison of a bad thermostat versus a bad water pump can help distinguish circulation problems from temperature-control faults.
Installation Recommendations
Never open the cooling system while the engine is hot. Pressurized coolant can cause serious burns.
General replacement steps include:
- Confirm the pump using the VIN and original part number.
- Allow the engine to cool completely.
- Disconnect the battery when required.
- Drain the coolant into an approved container.
- Remove the intake duct, fan shroud, fan, and belt as necessary.
- Disconnect the radiator and heater hoses.
- Remove the original water pump.
- Clean the engine’s sealing surfaces carefully.
- Compare the replacement and original pump castings.
- Verify the thermostat orientation.
- Install the supplied gasket.
- Tighten the fasteners to factory specifications.
- Reinstall the pulley, belt, hoses, fan, and shroud.
- Refill with the correct coolant.
- Bleed trapped air using the proper service procedure.
- Pressure-test the system and check for leaks.
Installation access differs between pickups, SUVs, vans, and cab-over trucks. Use service information for the exact vehicle.
Inspect Related Components
While the system is drained, inspect:
- Upper and lower radiator hoses
- Heater hoses and fittings
- Serpentine belt
- Belt tensioner
- Idler pulleys
- Fan clutch
- Expansion tank and cap
- Radiator
- Coolant condition
If the coolant is contaminated or unknown, consult our guide on flushing a cooling system safely.
Use the Correct Coolant
Use coolant meeting the GM specification for the exact vehicle. Do not choose antifreeze solely by color, since different coolant formulas can use similar dyes.
Our guide to IAT, OAT and HOAT coolant types explains why approved chemistry matters.
Collect used coolant in a sealed container and keep it away from children and animals.
Frequently Asked Questions
What vehicles does the OAW G7341B fit?
It fits selected 1999–2006 Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, and Saab vehicles using compatible 4.8L, 5.3L, or 6.0L GM V8 engines.
Is G7341B the same as AW5104?
G7341B and AW5104 are aftermarket references commonly associated with the same general GM water-pump design. Verify dimensions and vehicle fitment before treating them as interchangeable.
Does it replace ACDelco 252-845?
Yes. The OAW G7341B is marketed as an aftermarket replacement for ACDelco 252-845 and GM/ACDelco number 19195104.
Does the thermostat come installed?
The package includes a thermostat. Confirm whether it arrives preinstalled and verify its orientation before installing the assembly.
Is the gasket included?
Yes. A precut installation gasket is included.
Does it fit a 2007 Silverado or Sierra?
Generally, this version targets the earlier 1999–2006 platform. Most redesigned 2007 applications use a later water-pump design, although 2007 Classic models require VIN-specific verification.
Does it fit the 6.6L Duramax?
No. Duramax diesel engines use a different water pump and replacement procedure.
Can this pump fix engine overheating?
It can repair overheating caused by a failed pump or thermostat. It cannot correct radiator restriction, cooling-fan failure, low coolant, combustion leakage, or another unrelated fault.
Final Verdict
The OAW G7341B provides a complete water-pump, thermostat, and gasket package for numerous GM Gen III Vortec V8 applications. It is well suited to properly verified Silverado, Sierra, Tahoe, Yukon, Suburban, Escalade, Express, Savana, and related models produced primarily between 1999 and 2006.
The wide application range makes part-number verification essential. Match the old pump, check the outlet configuration, and confirm the VIN before ordering.
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