Dayco DP998 Engine Water Pump

Dayco DP998 Engine Water Pump

The Dayco DP998 engine water pump is a direct-fit cooling system replacement for a wide range of GM, Cadillac, GMC, and related applications. It is built for serpentine belt driven systems and listed with a 47mm thermostat bore diameter, making it a fitment-specific choice for vehicles that need the correct cooling system configuration.

Key Features

• Engine water pump for belt-driven cooling system service
• Serpentine belt driven design
• Thermostat bore diameter: 47mm
• Fits a broad range of trucks, SUVs, vans, and performance applications
• Dayco part number DP998 for catalog and service reference

Fitment Coverage

• Fits 2004-2006 Buick Rainier, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2002-2006 Cadillac Escalade, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 Cadillac Escalade ESV, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2002-2006 Cadillac Escalade EXT, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2002-2006 Chevrolet Avalanche 1500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 Chevrolet Express 1500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 Chevrolet Express 2500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 Chevrolet Express 3500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 1999-2006 Chevrolet Silverado 1500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2005-2006 Chevrolet Silverado 1500 HD, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2001-2003 Chevrolet Silverado 1500 HD, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2001-2006 Chevrolet Silverado 2500 HD, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2001-2006 Chevrolet Silverado 3500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 Chevrolet SSR, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2000-2006 Chevrolet Suburban 1500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2000-2006 Chevrolet Suburban 2500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2000-2006 Chevrolet Tahoe, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2006 Chevrolet Trailblazer, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 Chevrolet Trailblazer EXT, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2005-2006 GMC Envoy, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 GMC Envoy XL, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 GMC Savana 1500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 GMC Savana 2500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 GMC Savana 3500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 1999-2006 GMC Sierra 1500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2005-2006 GMC Sierra 1500 HD, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2001-2003 GMC Sierra 1500 HD, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2001-2006 GMC Sierra 2500 HD, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2001-2006 GMC Sierra 3500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2000-2006 GMC Yukon, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2000-2006 GMC Yukon XL 1500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2000-2006 GMC Yukon XL 2500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 Hummer H2, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2003-2006 Isuzu Ascender, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2005-2006 Saab 9-7x, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 2004-2005 GMC Envoy XUV, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 1999-2004 Chevrolet Silverado 2500, N/A; serpentine belt driven; thermostat bore diameter 47mm.
• Fits 1999-2004 GMC Sierra 2500, N/A; serpentine belt driven; thermostat bore diameter 47mm.

What It Helps Address

• Coolant circulation problems caused by a worn water pump
• Overheating concerns in serpentine belt driven cooling systems
• Leaks from a failing engine water pump assembly
• Temperature instability during daily driving or towing
• Service replacement needs on GM truck and SUV cooling systems

Installation Notes

Verify the vehicle’s belt drive setup and thermostat bore diameter before ordering. This part number, DP998, is listed for serpentine belt driven applications only, so matching the cooling system configuration is important for proper service. A cooling system inspection is recommended during replacement to confirm hoses, thermostat, and related components are in serviceable condition.

Quality Assurance

Dayco is a recognized name in automotive power transmission and cooling components. This engine water pump is cataloged for specific vehicle applications to support accurate parts selection for Chevrolet Silverado, GMC Sierra, and related GM platforms.