JkorkM AW5104 Water Pump with Integrated Thermostat for Chevy & GMC 4.8L/5.3L/6.0L — Pre-installed Thermostat, Gaskets Included

JkorkM AW5104 is a direct-replacement water pump assembly with an integrated thermostat engineered to restore reliable cooling for GM 4.8L, 5.3L and 6.0L engines.

If your GM truck or SUV is showing signs of cooling trouble, replacing the pump and thermostat as a single unit minimizes installation work and lowers the chance of leaks or thermostat failures later. This assembly ships with the thermostat pre-installed inside the pump housing plus the necessary gaskets and installation gloves to make swapping the unit straightforward for mechanics and experienced DIYers alike.

Which vehicles will this water pump and thermostat fit?

This JkorkM AW5104 assembly is built to match original-equipment fitment for many General Motors models across the 1999–2006 model years. It supports a wide range of Chevy, GMC, Buick, Cadillac, Hummer, Isuzu, Saab and commercial chassis applications that use GM 4.8L, 5.3L and 6.0L V8 engines.

• Chevrolet: Silverado, Express, Suburban, Tahoe, Trailblazer, SSR, W-series trucks — various 1999–2006 years.
• GMC: Sierra, Savana, Yukon, Envoy, W-series medium-duty models — compatible model years included.
• Other makes: Buick Rainier, Cadillac Escalade families, Hummer H2, Isuzu Ascender/NPR/NPR-HD, Saab 9-7X.

How does the integrated thermostat affect performance and reliability?

Having the thermostat installed inside the pump housing reduces sealing interfaces and eliminates a separate thermostat leak path. The thermostat responds to coolant temperature to regulate flow, and installing both components together restores intended operating temperatures more reliably than replacing one part alone.

• Thermostat pre-installed in housing to reduce assembly steps and leak points.
• Designed to maintain proper coolant circulation at engine operating temperature.
• Helps prevent premature overheating or extended warm-up times from a failing thermostat.

What OEM numbers and part cross-references does this replace?

The AW5104 assembly is manufactured to replace a broad set of OEM numbers commonly referenced for GM water pumps and thermostat housings. It covers many legacy part numbers so you can match it to your vehicle’s original parts list during parts lookup.

• Covers OEM references including AW5087, 12456113, 12458935, 12569519 and many others for broad compatibility.
• Cross-reference list included to simplify verification against dealer parts numbers or repair manuals.
• Intended as a direct replacement for vehicles originally equipped with those OEM numbers.

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

The package includes the water pump assembly with the thermostat already mounted, all required gaskets, and disposable installation gloves. This reduces the number of separate parts to source and speeds up installation when performing cooling-system service.

• One AW5104 water pump assembly with thermostat pre-installed inside the housing.
• Replacement gaskets to ensure correct sealing and fitment.
• Installation gloves and customer support for fitment questions and after-sale concerns.

Who is this for: The JkorkM AW5104 water pump with thermostat is ideal for owners and technicians maintaining GM 4.8L/5.3L/6.0L-powered trucks, SUVs and commercial vehicles from the late 1990s through mid-2000s. Choose this assembly when you want a comprehensive pump-and-thermostat replacement that simplifies installation, matches many OEM part numbers, and restores proper cooling operation without hunting for separate thermostat housings or gaskets.