JkorkM AW5104 Water Pump Assembly with Pre-Installed Thermostat for Chevy/GMC 4.8L–5.3L–6.0L, Gaskets Included

The JkorkM AW5104 is a complete water pump assembly with a pre-installed thermostat engineered to replace OEM units on Chevy, GMC, Buick, Cadillac, Hummer, Isuzu and Saab Vortec engines (4.8L, 5.3L, 6.0L).

This heavy-duty replacement combines the pump and thermostat in one sealed assembly to simplify installation and restore reliable coolant circulation for older GM engines. Designed to match the fit and mounting points of common OEM part numbers, the AW5104 kit arrives with gaskets and gloves so you can replace the pump and thermostat in a single service session. It targets vehicles from late 1990s through mid-2000s—truck and SUV platforms frequently showing wear in cooling components.

Which vehicles will this pump fit?

The AW5104 assembly is compatible with a long list of GM platforms using 4.8L, 5.3L and 6.0L engines. It replaces multiple OEM numbers so it fits many Express, Silverado, Sierra, Suburban, Tahoe, Yukon, Envoy, Savana and similar models from model years roughly 1999–2006. Always cross-check the listed OEM part numbers and engine displacement with your vehicle’s VIN before ordering.

• Fits Chevy, GMC, Buick, Cadillac, Hummer, Isuzu and Saab models listed for 1999–2006.
• Replaces OEM part numbers: AW5104, AW5087, 12456113, 12569519, and many more.
• Intended for 4.8L, 5.3L and 6.0L Vortec engines used in trucks and SUVs.

How does combining pump and thermostat help when servicing cooling systems?

Installing a pump with the thermostat already inside minimizes leak risk and guarantees the thermostat seating and sensor alignment are correct. This integrated approach reduces labor time compared with separate parts and helps ensure the replaced components behave as a matched set under normal engine temperatures.

• Thermostat pre-installed in pump housing for correct fitment.
• Sealed assembly reduces chances of coolant leaks at the mating surfaces.
• Single part number simplifies ordering and inventory for shops.

What comes in the package and what should I expect during installation?

The shipment includes one AW6009 water pump assembly (AW5104 family) with thermostat pre-installed, all required gaskets, and disposable installation gloves. Typical installation requires draining coolant, removing the accessory drive components as needed, swapping the pump assembly, installing the new gaskets, and refilling and bleeding the cooling system.

• Includes pump assembly, gaskets and gloves—thermostat is pre-installed.
• Follow factory torque specs and coolant fill/bleed procedures for best results.
• Recommended: inspect belts, hoses and coolant condition while servicing.

Will this improve my vehicle’s cooling reliability?

Replacing an old water pump and thermostat with a matched assembly reduces the chances of thermostat failure, leaks around the pump flange, and flow restrictions caused by worn impellers. While it won’t change engine tuning, it restores the original coolant flow path and thermostat operation when installed correctly.

• New impeller and housing restore coolant flow performance.
• New thermostat helps maintain designed operating temperature range.
• Quality control aims to match original fit and function—inspect gasket surfaces before installation.

Who is this for: This JkorkM AW5104 water pump with thermostat is aimed at DIY mechanics, independent repair shops and fleet managers servicing GM trucks and large SUVs from the 1999–2006 era who need a dependable, single-part replacement that covers numerous OEM numbers. Choose this assembly if you want a direct-fit pump/thermostat unit with included gaskets and a straightforward install process to restore your vehicle’s cooling system.