Marsram Engine Water Pump with Thermostat — Direct-Fit GM Replacement, Complete Assembly

Marsram Engine Water Pump with integrated thermostat replaces factory units on compatible GM and related vehicles to restore coolant circulation and temperature control.

Designed for direct-fit replacement in a wide range of Chevrolet, GMC, Cadillac, Hummer, Isuzu, Saab and Workhorse applications, this Marsram assembly pairs a precision-cast housing, durable impeller and a preinstalled thermostat to simplify swapouts and get your cooling system back to spec. The unit is built to meet or exceed OEM tolerances, ships complete with gaskets and seals, and arrives backed by Marsram's 12-month unlimited-mileage warranty for added peace of mind.

Which vehicles will this Marsram water pump fit?

This pump is engineered for specific GM platforms and several related marques produced in overlapping years. Always verify fitment by cross-referencing your VIN or the listed replacement part numbers before purchase.

• Chevrolet: Silverado 1500/2500/3500 (1999–2006 ranges), Tahoe, Suburban, Avalanche, TrailBlazer, SSR, Express vans.
• GMC: Sierra 1500/2500/3500, Yukon/Yukon XL, Savana vans, Envoy models and select HD variants (1999–2006).
• Also fits: Hummer H2 (2003–2006), Isuzu Ascender/NPR models, Saab 9-7X (2005–2006), and multiple Workhorse chassis models.

How does this pump simplify installation compared with replacing separate parts?

The Marsram assembly arrives with the thermostat preinstalled and includes the necessary gaskets, minimizing parts matching and reducing reassembly time. The direct-fit design mirrors OEM mounting points and coolant passages for a straightforward swap.

• Comes as a complete assembly with thermostat and seals—no need to source extra components.
• OEM-style mounting points and dimensions for bolt-on replacement.
• Pre-sealed housings reduce the chance of leaks at installation.
• Clear replacement part numbers included to confirm compatibility before starting the job.

What materials and construction features support durability?

Built using corrosion-resistant cast housing and a reinforced impeller, the pump is engineered to withstand typical operating conditions while maintaining proper coolant flow and temperature regulation.

• Precision-cast housing resists warping and maintains sealing surfaces.
• High-strength impeller designed for consistent flow and reduced cavitation.
• Quality bearings and seals chosen to limit premature leakage and failure.
• Thermostat calibrated to match original equipment temperature thresholds.

What warranty and support does Marsram provide if issues arise?

Marsram supports this water pump with a 12-month unlimited-mileage warranty and customer service to address fitment, installation questions, or performance concerns.

• 12-month unlimited-mileage warranty for peace of mind.
• Customer support available for installation guidance and technical questions.
• Replacement part numbers and Amazon-confirmed fit instructions to verify compatibility quickly.

Who is this for: The Marsram Engine Water Pump w/Thermostat is aimed at owners and DIY mechanics of late-1990s to mid-2000s GM trucks, SUVs, vans and related chassis who need a reliable, direct-replacement cooling component without hunting for separate parts. It's also well suited for professional technicians and fleet managers seeking a one-piece solution that restores coolant circulation and thermostat control while matching factory dimensions and mounting. Before ordering, confirm your vehicle year, make and model and cross-check one of the listed replacement part numbers to ensure an exact fit.