Fitment Warning: Engine Origin Matters
Buick, Oldsmobile and Pontiac frequently installed engines produced by different GM divisions during this era. A 5.0L Oldsmobile V8 and a Chevrolet-built 5.0L V8 are not automatically interchangeable.
Confirm:
- Engine manufacturer and displacement
- Standard versus reverse pump rotation
- V-belt versus serpentine-belt drive
- Long versus short water-pump design
- Threaded power-steering mounting boss
- Standard versus heavy-duty cooling
- Hose-port arrangement
- Original casting and interchange number
The safest approach is to compare the original pump with 252-595 and verify the complete vehicle configuration through a parts catalog.
Known Fitment Examples
Cataloged examples include:
- 1980 Chevrolet Malibu with 5.7L V8
- 1985–1986 Chevrolet C10 with 5.0L V8
- 1985–1987 Chevrolet Camaro with 5.0L V8
- 1985–1987 Chevrolet El Camino with 5.0L V8
- 1987 Chevrolet R10 with 5.7L V8
- 1993–1995 Chevrolet P30 with 4.3L V6 or 5.7L V8
- 1996 Chevrolet P30 with 5.7L V8
- 1993–1996 GMC P3500 with 5.7L V8
These examples confirm the pump family but do not mean every trim or engine within that model year uses it.
Interchange and Reference Numbers
- ACDelco 252-595
- GM 88926109
- Gates 43099
- Gates 43099P
- GMB 130-1250
- GMB 130-1250HD
- WP-520
- AW1121
- 58-147
- 55-11115
- GM 10048917
- GM 10108453
- GM 12307869
- GM 12522033
- GM 12524131
- GM 12529305
- GM 12551306
- GM 14085847
- GM 461996
- GM 474029
The official GM parts listing identifies 88926109 as ACDelco 252-595.
Product Specifications
| Specification | Details |
|---|---|
| Brand | ACDelco Gold |
| Part number | 252-595 |
| GM reference | 88926109 |
| Pump type | Mechanical |
| Rotation | Standard |
| Typical drive | V-belt |
| Housing material | Cast iron |
| Impeller material | Stamped steel |
| Mounting holes | Four |
| Pulley included | No |
| Thermostat included | No |
| Mounting bolts included | No |
| Typical requirement | Threaded power-steering boss; no serpentine belt |
| Weight | Approximately 3.2 pounds |
Some third-party data incorrectly categorizes this pump as timing-belt driven. The equivalent Gates 43099 specifications identify it as not timing-belt driven, with a cast-iron housing and standard-rotation impeller.
What Comes in the Box?
Package contents may include:
- One ACDelco 252-595 water pump
- Required pump gaskets or seals
- Port plug where supplied
The pulley, thermostat and mounting bolts are not included. Inspect the package before disassembling the vehicle.
ACDelco Gold Construction
ACDelco describes this premium aftermarket pump as using:
- Coated seals for improved durability
- Heat-treated shaft assemblies
- Permanently sealed and lubricated bearings
- Uniform wall sections
- Smooth internal coolant passages
- Leak-tested construction
The pump is designed as a stock replacement, not a high-flow racing upgrade. “Gold” is the product tier, not a promise that the impeller was blessed by a small-block wizard.
Standard-Rotation Versus Reverse-Rotation Pumps
Traditional V-belt systems normally turn the water pump in the same direction as the crankshaft. This is called standard rotation.
Many later serpentine systems route the back side of the belt around the pump pulley, causing the pump to turn in the opposite direction. Those systems require a reverse-rotation impeller.
Installing the wrong rotation can dramatically reduce coolant flow even when the pump bolts to the engine. Verify belt routing and pump design before installation.
Long Versus Short Small-Block Water Pumps
Classic Chevrolet small-block engines use both short and long water-pump configurations. The difference affects:
- Pulley alignment
- Alternator brackets
- Power-steering brackets
- Fan position
- Radiator clearance
- Accessory-belt alignment
ACDelco 252-595 belongs to the long-style, standard-rotation application family. It should not be substituted for a short pump simply because the bolt holes appear cooperative.
Common Signs of Water-Pump Failure
- Coolant leaking from the weep hole
- Dried coolant residue around the pump
- Bearing growl or grinding
- Pulley or fan wobble
- Repeated belt misalignment
- Engine overheating
- Reduced coolant circulation
- Coolant loss near the front of the engine
Use our coolant-leak diagnosis guide to confirm the source. Our bad thermostat versus bad water pump guide can help distinguish two common overheating causes.
Installation Recommendations
- Confirm the pump number, rotation and mounting depth.
- Allow the engine to cool completely.
- Disconnect the negative battery cable.
- Drain the coolant safely.
- Remove the fan, pulley and drive belts.
- Inspect the fan clutch, pulley and accessory brackets.
- Clean the block’s gasket surfaces carefully.
- Install the supplied gaskets according to ACDelco instructions.
- Apply thread sealant only where required by the service procedure.
- Torque fasteners to the proper specification.
- Confirm pulley and belt alignment.
- Refill with the correct coolant mixture.
- Bleed trapped air and inspect for leaks.
If the old coolant contains rust or mixed antifreeze, follow our cooling-system flushing guide. Use our coolant-types guide to select fluid by specification rather than color.
Frequently Asked Questions
What vehicles does ACDelco 252-595 fit?
It fits numerous 1970s through mid-1990s GM passenger cars, trucks, vans and commercial chassis using compatible Chevrolet V6 or small-block V8 engines with standard-rotation V-belt drives.
Does it fit every Chevrolet 350 engine?
No. Chevrolet used short pumps, long pumps, standard-rotation pumps and reverse-rotation pumps across different years and accessory systems. Verify the original configuration.
Does 252-595 fit a serpentine-belt engine?
It is generally cataloged for applications without a serpentine belt. Later reverse-rotation serpentine systems require a different pump.
Is this pump driven by a timing belt?
No. It is an externally driven mechanical pump, normally used with V-belts.
Is the pulley included?
No. The original pulley must normally be transferred or replaced separately.
Is the thermostat included?
No. The thermostat and housing are separate parts.
Does it fit Buick, Oldsmobile and Pontiac V8 engines?
Only selected vehicles using the compatible Chevrolet-built engine. It does not automatically fit Buick-, Oldsmobile- or Pontiac-designed engines of similar displacement.
There are no reviews yet.