Compatible Engines
This pump is primarily intended for earlier GM 1.4L turbocharged Ecotec applications, commonly associated with engine codes including:
- LUJ
- LUV
It does not fit every GM 1.4L engine. Naturally aspirated engines and later-generation turbocharged engines may use different pumps.
Product Specifications
| Specification | Details |
|---|---|
| Brand | ACDelco Gold |
| Part number | 252-996 |
| Alternate number | 19357963 |
| Product type | Mechanical engine water pump |
| Drive system | Serpentine belt |
| Fitment type | Vehicle-specific |
| Gaskets and seals | Included |
| Bearings | Permanently sealed and lubricated |
| Shaft treatment | Heat-treated |
| Seal construction | Coated for durability |
| Condition | New aftermarket replacement |
ACDelco Gold Versus GM Genuine Parts
ACDelco Gold is ACDelco’s premium aftermarket product line. The 252-996 is not necessarily the same component installed at the GM assembly plant, even though it is engineered as a high-quality replacement for compatible GM vehicles.
The official ACDelco Gold 19357963 product page describes it as a serpentine-belt-driven pump that works with the thermostat to circulate coolant through the radiator and engine.
In simple terms:
- GM Genuine Parts: Intended to represent original-equipment service components
- ACDelco Gold: Premium aftermarket replacement line
- ACDelco Silver: Value-oriented aftermarket line
For a daily-driven Encore, Cruze, Sonic, or Trax, ACDelco Gold provides a recognizable branded alternative to generic replacement pumps.
Product Benefits
Thoroughly Tested
ACDelco states that its Gold water pumps are tested for dependable, leak-free operation. Testing is particularly important around the shaft seal, gasket surfaces, casting, and bearing assembly.
Coated Seals
The pump uses coated seals intended to improve durability and seal life. Mechanical-seal condition is critical because the pump shaft passes from the dry bearing area into the coolant side of the housing.
Heat-Treated Shaft Assembly
Heat treatment improves shaft strength and wear resistance compared with an untreated component. The shaft must support the pulley and impeller while operating under continuous belt load.
Permanently Lubricated Bearings
The internal bearings are sealed and lubricated during manufacturing. They do not require periodic greasing or adjustment.
Installation Components Included
The package includes applicable:
- Water-pump gaskets
- Seals
- O-rings
Inspect the package before disassembling the vehicle and compare every supplied seal with the original components.
How the ACDelco 252-996 Water Pump Works
The engine’s serpentine belt drives the pump pulley. The pulley turns a shaft connected to the internal impeller, which circulates coolant through the:
- Engine block
- Cylinder head
- Turbocharger cooling circuit
- Heater core
- Thermostat housing
- Radiator
Coolant absorbs engine heat and transfers it to the radiator. The thermostat regulates when coolant flows through the primary radiator circuit, while the cooling fan moves air across the radiator when necessary.
Signs of a Failing GM 1.4L Water Pump
Common warning signs include:
- Coolant leaking near the pump
- Dried orange, pink, or white residue
- Grinding or rumbling bearing noise
- Pulley movement or wobble
- Engine overheating
- Unstable temperature readings
- Weak cabin heat
- Repeated coolant loss
- Coolant odor after driving
- Steam from the engine compartment
A water-pump leak can resemble leakage from a thermostat housing, coolant outlet, hose connection, expansion tank, or turbocharger coolant line. Use our guide explaining how to find a coolant leak before ordering parts.
Can the Pump Fail Without Leaking?
Yes. A pump may develop:
- Worn bearings
- A damaged impeller
- A loose impeller-to-shaft connection
- Restricted coolant passages
- Pulley or shaft misalignment
These failures can reduce coolant circulation without creating an obvious puddle. Symptoms may include overheating or cabin heat that changes with engine speed.
Our guide comparing a bad thermostat with a bad water pump explains how these failures can produce similar symptoms.
Installation Recommendations
Never open the cooling system while the engine is hot. Pressurized coolant can cause severe burns.
General installation steps include:
- Confirm fitment using the VIN and original pump.
- Allow the engine to cool completely.
- Disconnect the battery when required.
- Drain the coolant into a suitable container.
- Remove components blocking pump access.
- Release the serpentine-belt tension.
- Remove the pulley and original pump.
- Clean the engine’s sealing surface carefully.
- Compare the new and removed pumps.
- Install the supplied gasket or O-ring.
- Tighten fasteners to GM specifications.
- Reinstall the pulley and serpentine belt.
- Refill with the specified coolant.
- Bleed air using the correct GM procedure.
- Pressure-test and inspect for leaks.
Use service information for the exact model. The Encore, Cruze, Sonic, and Trax package the 1.4L engine differently, so access procedures are not always identical.
Inspect Related Components
While replacing the pump, inspect:
- Serpentine belt
- Belt tensioner
- Idler pulley
- Thermostat and housing
- Coolant outlet housing
- Expansion tank and pressure cap
- Radiator and heater hoses
- Turbocharger coolant lines
- Radiator
- Cooling-fan operation
A new pump installed into a contaminated or neglected cooling system may have a shorter service life.
Use the Correct Coolant
Use coolant meeting the GM specification for the vehicle’s model year. Do not select coolant only by color because different formulas can look similar while using incompatible additive chemistry.
Read our guide to IAT, OAT and HOAT coolant types before changing or mixing coolant.
If the existing coolant is contaminated or its history is unknown, consult our guide on flushing a cooling system without damaging it.
Frequently Asked Questions
What vehicles does ACDelco 252-996 fit?
The primary applications are selected 2013–2020 Buick Encore, 2011–2015 Chevrolet Cruze, 2016 Cruze Limited, 2012–2020 Chevrolet Sonic, and 2013–2020 Chevrolet Trax models with the compatible 1.4L turbo engine.
Does ACDelco 252-996 fit a 2016 Cruze?
It commonly fits the 2016 Cruze Limited with the earlier 1.4L turbocharged engine. It should not automatically be ordered for the redesigned second-generation 2016 Cruze.
Does it fit a Chevrolet Sonic with the 1.8L engine?
No. The 1.8L naturally aspirated engine uses a different water-pump configuration. Confirm that the Sonic has the compatible 1.4L turbo engine.
Is ACDelco 252-996 the same as 19357963?
Yes. ACDelco identifies the pump using catalog number 252-996 and alternate product number 19357963.
Are gaskets included?
Yes. ACDelco states that the applicable gaskets, seals, and O-rings are packaged with its Professional/Gold replacement water pump.
Is the thermostat included?
The product description identifies the component as an engine water pump and does not state that a thermostat is included. Purchase the thermostat separately if replacement is required.
Is this an original GM water pump?
It is an ACDelco Gold premium aftermarket part. It is not necessarily the same as a GM Genuine Parts original-equipment service pump.
Can this pump repair an overheating engine?
It can resolve overheating caused by a failed or leaking water pump. It cannot correct a stuck thermostat, failed cooling fan, restricted radiator, combustion leak, or another unrelated cooling-system fault.
Final Verdict
The ACDelco Gold 252-996 is a strong branded replacement for compatible GM 1.4L turbocharged vehicles. Its coated seals, heat-treated shaft, sealed bearings, included installation seals, and ACDelco-backed engineering make it particularly appealing for owners who prefer a recognized aftermarket manufacturer over a generic pump.
Fitment is straightforward for most Encore, Sonic, and Trax applications, but Cruze owners should verify whether they have a first-generation Cruze, a 2016 Cruze Limited, or the redesigned second-generation model.
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