HomeBelts and Cooling > Water Pump and Related ComponentsDayco DP1226B Engine Water Pump
Part #: DP1226B

Dayco DP1226B Engine Water Pump

⚙️ 92 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Chevrolet and GMC, Express 2500, Express 3500, Savana 2500, Savana 3500, Sierra 2500 HD, Sierra 2500 HD Classic, Sierra 3500, Sierra 3500 Classic, Sierra 3500 HD, Silverado 2500 HD, Silverado 2500 HD Classic, Silverado 3500, Silverado 3500 Classic, and Silverado 3500 HD
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Reliable Engine Water Pump for Chevrolet and GMC Trucks

The Dayco DP1226B engine water pump is designed to maintain optimal engine temperature for heavy-duty Chevrolet and GMC trucks. Engineered for models like the Silverado 2500 HD and Sierra 3500, this water pump ensures consistent coolant flow and reliable performance under demanding conditions.

  • Compatible with Chevrolet Express 2500, Express 3500, GMC Savana 2500, Savana 3500, Sierra 2500 HD, Sierra 3500, Silverado 2500 HD, and Silverado 3500 models
  • Direct replacement for factory water pumps to maintain proper engine cooling
  • Durable construction designed for heavy-duty truck applications
  • Part number DP1226B ensures precise fit and function
  • Supports engine cooling system efficiency to prevent overheating

Product Details and Compatibility

The Dayco DP1226B engine water pump is specifically engineered for use in Chevrolet and GMC heavy-duty trucks, including the Express 2500 and 3500 series, Savana 2500 and 3500, Sierra 2500 HD and 3500 HD, as well as Silverado 2500 HD and 3500 HD models. This pump is a critical component in the vehicle's cooling system, circulating coolant through the engine block and radiator to maintain optimal operating temperatures. Its design matches OEM specifications to ensure proper fitment and reliable operation.

Common Applications and Problem Resolution

  • Replaces failing or leaking water pumps causing coolant loss
  • Addresses engine overheating due to insufficient coolant circulation
  • Resolves unusual noises from worn or damaged pump bearings
  • Prevents engine damage related to cooling system failure
  • Restores proper coolant flow in Chevrolet and GMC heavy-duty trucks

Installation Notes and Tips

When installing the Dayco DP1226B water pump, ensure the cooling system is fully drained before removal of the old pump. Clean the mounting surface thoroughly to prevent leaks. Use a new gasket or sealant as recommended by the vehicle manufacturer. After installation, refill the cooling system and bleed air pockets to avoid overheating. Verify compatibility with your specific Chevrolet or GMC model year and engine configuration prior to installation.

Quality Assurance and Warranty

Dayco manufactures the DP1226B engine water pump to meet stringent quality standards for durability and performance. While specific warranty details are not provided here, Dayco products typically come with manufacturer-backed warranties covering defects in materials and workmanship. Refer to Dayco’s official documentation or your parts supplier for exact warranty terms.

This part fits 92 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2016ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2016ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2016ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2016ChevroletSilverado 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2016GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2016GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2016GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2016GMCSierra 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2015ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2015ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2015ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2015ChevroletSilverado 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2015GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2015GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2015GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2015GMCSierra 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2014ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2014ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2014ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2014ChevroletSilverado 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2014GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2014GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2014GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2014GMCSierra 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2013ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2013ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2013ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2013ChevroletSilverado 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2013GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2013GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2013GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2013GMCSierra 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2012ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2012ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2012ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2012ChevroletSilverado 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2012GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2012GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2012GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2012GMCSierra 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2011ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2011ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2011ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2011ChevroletSilverado 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2011GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2011GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2011GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2011GMCSierra 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2010ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2010ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2010ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2010ChevroletSilverado 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2010GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2010GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2010GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2010GMCSierra 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2009ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2009ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2009ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2009ChevroletSilverado 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2009GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2009GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2009GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2009GMCSierra 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2008ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2008ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2008ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2008ChevroletSilverado 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2008GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2008GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2008GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2008GMCSierra 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007ChevroletSilverado 2500 HD Classic6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007ChevroletSilverado 3500 Classic6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007ChevroletSilverado 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007GMCSierra 2500 HD Classic6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007GMCSierra 3500 Classic6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2007GMCSierra 3500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2006ChevroletExpress 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2006ChevroletExpress 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2006ChevroletSilverado 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2006ChevroletSilverado 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2006GMCSavana 25006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2006GMCSavana 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing
2006GMCSierra 2500 HD6.6LV8N/ASerpentine Belt Driven; w/Back Housing
2006GMCSierra 35006.6LV8N/ASerpentine Belt Driven; w/Back Housing

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.