Performance Water Pump Kit for Hummer H2 (2007-2009) 6.0L 6.2L

Heavy-Duty Performance Water Pump Kit for 2007-2009 Hummer H2 (GMT820)

What it Does: The Performance Water Pump Kit replaces the failure-prone factory coolant pump and thermostat on the 2007-2009 Hummer H2 to ensure consistent coolant circulation, stabilize operating temperatures, and prevent engine overheating under extreme loads.

The Stock Hummer H2 Cooling System Vulnerability

Factory water pumps on the GMT820 platform housing the LQ4 and L92 V8 engines are known for premature mechanical shaft seal weeping and internal bearing wear. Sustained high-thermal cycles and heavy towing loads accelerate impeller degradation and cause factory thermostat housings to warp, resulting in coolant loss, air ingress, and severe localized cylinder head hot spots.

The Engineering Solution

This direct-fit replacement water pump features a reinforced cast-aluminum housing and a dynamically balanced impeller engineered to maximize volumetric flow and eliminate coolant cavitation across all RPM bands. Fitted with severe-duty ceramic shaft seals, high-load industrial bearings, and precision-stamped porting, this assembly resists shaft deflection and pressure spikes. The matched thermostat unit and high-temp elastomeric gaskets deliver a leak-free seal without requiring RTV silicone.

What's Included

• 1 Engine Water Pump
• 1 Thermostat Housing
• 1 Thermostat
• 2 Rectangular Gaskets
• 1 Oval Gasket
• 2 Mounting Bolts

Technical Specifications

Compatibility

• 2007 Hummer H2 SUV / SUT (6.0L V8 LQ4)
• 2008 Hummer H2 SUV / SUT (6.2L V8 L92)
• 2009 Hummer H2 SUV / SUT (6.2L V8 L92)

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT820 H2?

Yes, this is a direct fit for the 2007-2009 Hummer H2 equipped with the 6.0L LQ4 or 6.2L L92 Vortec engine.

What is the proper installation procedure for this pump assembly?

Torque all pump-to-block fasteners to factory specification in two passes (11 lb-ft initial, 22 lb-ft final) and perform a thorough cooling system vacuum bleed to eliminate air pockets.

The Hummer Heavy-Duty Caliber

Engineered to match the brutal thermal demands of heavy vehicle payloads and demanding overland trails, providing continuous cooling efficiency where standard replacement units fail.