What Is Included?
This package is advertised to include:
- One mechanical engine water pump
- One thermostat
- One thermostat housing
- Installation gaskets and seals
Inspect the package before beginning installation. Coolant, hoses, clamps, bolts and specialty tools are not normally included.
Water-Pump Reference Numbers
The water pump cross-references the following numbers:
- AW6662
- US6662
- ACDelco 252-996
- GM 19357963
- GM 25192709
- GM 55579016
- Gates 43080
- GMB 130-2140
- SKP SK1302140
- WPK819
- DP291
- W2274M
- 22519445
- 55484625
- 55486342
- 55486344
- 55561623
- 55587345
- 55595610
- 55599494
ACDelco identifies 252-996 and 19357963 as equivalent water-pump references.
Not every number necessarily represents the complete kit. Some identify the pump assembly, while others may identify superseded GM components or aftermarket equivalents.
Thermostat and Housing Reference Numbers
The thermostat housing supplied with the kit may replace:
- GM 55565336
- GM 55579010
- GM 55593034
- Dorman 902-808
- MotoRad 730-221
- Gates 34709
- ACDelco 131-180
- Four Seasons 85993
- Mahle TM 36 103
- TE7250103J
- V40-99-1098
- GM0712937
Dorman lists its 902-808 thermostat housing for the 2013–2021 Buick Encore, 2011–2015 Cruze, 2016 Cruze Limited, 2012–2020 Sonic and 2013–2021 Trax.
Why Replace the Water Pump and Thermostat Together?
The water pump and thermostat perform separate but closely connected jobs:
- The water pump circulates coolant through the engine.
- The thermostat controls when and how quickly coolant flows through the radiator.
- The thermostat housing seals and directs coolant between components.
Either component can cause overheating or inconsistent engine temperature. Replacing both while the cooling system is drained can prevent duplicated labor, especially on a higher-mileage vehicle.
Our bad thermostat versus bad water pump guide explains how their symptoms differ.
Common Water-Pump Failure Symptoms
A failing AW6662-style water pump may cause:
- Coolant leaking from the pump
- Dried coolant residue around the housing
- Grinding or growling bearing noise
- Pulley movement or shaft play
- Engine overheating
- Reduced coolant circulation
- Repeated low-coolant warnings
- Serpentine-belt tracking problems
A noisy pump bearing or leaking shaft seal requires replacement. Stop-leak cannot repair a loose bearing or rebuild a mechanical seal, despite whatever motivational speech the bottle gives you.
Common Thermostat-Housing Problems
The original plastic thermostat housing may eventually develop:
- Cracks around the housing
- Gasket or O-ring leakage
- Electrical thermostat-control faults
- A thermostat stuck open or closed
- Slow engine warm-up
- Temperature fluctuations
- Cooling fans that run excessively
- Stored cooling-system trouble codes
A thermostat stuck closed can cause rapid overheating. A thermostat stuck open commonly causes slow warm-up, weak heater output and an engine temperature that falls during highway driving.
Product Benefits
- Complete pump-and-thermostat repair package
- Direct-replacement mounting configuration
- Designed for the GM 1.4L turbo engine
- Gaskets and seals included
- Replaces several common GM and aftermarket numbers
- One-year seller warranty
- Reduces the need to order cooling-system components separately
Claims about advanced testing or OE-equivalent quality should be treated as manufacturer claims unless supported by published certification and test documentation. Fitment and installation quality remain just as important as the paragraph on the box.
Installation Recommendations
- Verify the engine is the turbocharged 1.4L.
- Compare the pump, thermostat housing and connectors with the original parts.
- Allow the engine to cool completely.
- Disconnect the negative battery cable.
- Drain the cooling system safely.
- Inspect the serpentine belt and tensioner.
- Clean all sealing surfaces carefully.
- Install new gaskets without excessive sealant.
- Torque fasteners according to GM service information.
- Refill with the specified coolant mixture.
- Bleed trapped air from the cooling system.
- Inspect for leaks and confirm stable operating temperature.
Do not open the coolant reservoir while the system is hot or pressurized.
If the old coolant is contaminated, follow our cooling-system flushing guide. Select the replacement coolant by specification—not merely by color—using our automotive coolant guide.
Diagnose Before Replacing Parts
Overheating can also be caused by:
- Low coolant
- Air trapped in the system
- A leaking reservoir or hose
- Radiator restriction
- Cooling-fan failure
- Faulty temperature sensor
- Cylinder-head or head-gasket damage
- Turbocharger cooling-line leakage
Use our coolant-leak diagnostic guide to identify the source before replacing the pump.
Frequently Asked Questions
Does AW6662 fit a 2016 Chevrolet Cruze?
It fits the 2016 Cruze Limited with the 1.4L turbo engine. It should not be assumed to fit the redesigned second-generation 2016 Cruze.
Does this kit fit a 1.8L Chevrolet Sonic?
No. The listed Sonic application requires the 1.4L turbo engine.
Does it fit a 2013 Chevrolet Trax in the United States?
The Trax was not officially offered in the United States until the 2015 model year. A 2013–2014 application would generally be a Canadian or other non-U.S.-market vehicle.
Does the kit include the thermostat housing?
Yes. The supplied references indicate an integrated thermostat-and-housing assembly, plus the separate mechanical water pump.
Are 252-996 and 19357963 the same reference?
Yes. ACDelco 252-996 uses manufacturer reference number 19357963.
Is this water pump electrically driven?
No. AW6662 is a mechanical engine water pump. The thermostat housing incorporates electrical control and sensing components, but that does not make the water pump electric.
Is this kit compatible with every Buick Encore through 2020?
Only listed Encore models equipped with the compatible 1.4L engine and matching original components. Verify the VIN and OE numbers because engine and emissions configurations can vary.
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