Performance Water Pump Kit for Chevrolet Colorado (2009-2012) 5.3L

Heavy-Duty Performance Water Pump Kit for 2009-2012 Chevrolet Colorado (GMT355)

What it Does: The Performance Water Pump Kit replaces the failure-prone factory cooling assembly on the 2009-2012 Colorado to stabilize operating temperatures and prevent thermal breakdown under heavy towing loads.

The Stock Chevrolet Colorado Water Pump Limitation

Factory cooling assemblies on the GMT355 chassis equipped with the 5.3L LH8 and LH9 V8 engines suffer from premature bearing wear and mechanical shaft seal deterioration. In tight midsize truck engine bays, high heat cycles cause the OEM unitized seals to harden, inducing coolant weep-hole leaks, system depressurization, and localized hot-spotting that risks head gasket compromise during sustained grade pulls.

The Engineering Solution

This direct-fit water pump assembly features a precision-cast aluminum housing paired with a heavy-duty, hardened bearing assembly to resist radial play and belt-load fatigue. An optimized internal impeller profile promotes uniform coolant velocity and reduces cavitation at high RPM. Precision-machined mating surfaces and premium multi-layer seals ensure leak-free sealing under elevated cooling system pressures, while the matched thermostat assembly ensures tight thermal regulation.

What's Included

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

Technical Specifications

Compatibility

• 2009-2012 Chevrolet Colorado LT 5.3L V8
• 2009-2012 Chevrolet Colorado WT 5.3L V8
• 2009-2012 Chevrolet Colorado Z71 / ZQ8 5.3L V8

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT355 Colorado?

Yes, this is a direct fit for the 2009-2012 Chevrolet Colorado equipped with the LH8 or LH9 5.3L V8 engine. Does not fit 2.9L LLV inline-4 or 3.7L LLR inline-5 engine configurations.

What is the correct installation torque for the mounting hardware?

Torque the water pump bolts in a crisscross sequence to 11 lb-ft on the first pass and 22 lb-ft on the final pass to ensure a uniform seal.

The Chevrolet Truck Standard

Engineered for high-demand towing and severe operating conditions, this cooling system component restores dependable heat rejection to keep your V8 truck on the road.