2011–2016 LML 6.6L Duramax Cooling System Refresh Kit

Refresh Your Cooling System. Built for the Duramax.

Your 2011–2016 GM 6.6L LML Duramax was built to work hard.

Years of towing, hauling, high engine-bay temperatures, vibration, and repeated heat cycles can take a toll on aging cooling-system components. When one component starts to show its age, other factory components may not be far behind.

Instead of replacing cooling components one at a time, the SPELAB Cooling System Refresh Kit combines three key cooling-system components into one complete package:

Upper Coolant Tube + Aluminum Radiator + Coolant Reservoir Tank

Designed specifically for LML 6.6L Duramax-powered Chevrolet Silverado and GMC Sierra HD trucks, this kit provides a practical way to refresh aging cooling components and build a more durable foundation for daily driving, towing, hauling, and heavy-duty use.

WHY REFRESH YOUR LML DURAMAX COOLING SYSTEM?

YEARS OF HEAT, PRESSURE & VIBRATION TAKE THEIR TOLL

The cooling system operates every time your Duramax is running.

Repeated heat cycles, coolant pressure, engine vibration, towing loads, and years of service can accelerate wear on factory cooling components.

For an older LML Duramax, refreshing multiple aging components together can be a smarter preventative-maintenance strategy than waiting for each individual part to fail.

ONE KIT. THREE KEY COMPONENTS.

The SPELAB Cooling System Refresh Kit brings together:

01. UPPER COOLANT TUBE

Refresh the factory coolant-routing system with a durable replacement designed to withstand the heat and vibration found in the LML Duramax engine bay.

02. ALUMINUM RADIATOR

The radiator is the primary heat exchanger for the engine cooling system. A refreshed radiator provides a solid foundation for maintaining efficient coolant heat transfer during everyday and heavy-duty operation.

03. COOLANT RESERVOIR TANK

Replace an aging factory reservoir with a durable replacement designed for continuous exposure to engine-bay heat and coolant-system pressure.

Together, these components provide a more comprehensive cooling-system refresh than replacing a single component alone.

BUILT FOR THE LML 6.6L DURAMAX

UPGRADE THE COMPONENTS THAT MATTER

The LML Duramax is designed for demanding work, and its cooling system plays a critical role in keeping engine temperatures under control.

Instead of replacing only the component that has already failed, the SPELAB Cooling System Refresh Kit allows you to address multiple key cooling components at the same time.

UPPER COOLANT TUBE

Designed as a replacement for the factory coolant tube, helping refresh a critical coolant-routing component exposed to heat, pressure, vibration, and repeated thermal cycling.

ALUMINUM RADIATOR

The radiator transfers heat from the engine coolant to the surrounding air.

A properly functioning radiator is essential for maintaining stable coolant temperatures, especially when your Duramax is towing or hauling under load.

COOLANT RESERVOIR TANK

The coolant reservoir accommodates coolant expansion and contraction as the engine temperature changes.

Replacing an aging reservoir helps refresh another critical component of the cooling system and provides added confidence for long-term use.

WHAT'S INCLUDED

SPELAB 2011–2016 LML 6.6L Duramax Cooling System Refresh Kit includes:

• 1 × Upper Coolant Tube
• 1 × Aluminum Radiator
• 1 × Coolant Reservoir Tank
• Installation hardware / accessories as applicable to each component

Please Note: Exact fittings, clamps, brackets, and installation hardware may vary depending on the specific kit configuration. Please verify the product configuration before ordering.

2011–2016 Chevrolet Silverado 2500HD 6.6L LML Duramax Turbo Diesel

2011–2016 Chevrolet Silverado 3500HD 6.6L LML Duramax Turbo Diesel

2011–2016 GMC Sierra 2500HD 6.6L LML Duramax Turbo Diesel

2011–2016 GMC Sierra 3500HD 6.6L LML Duramax Turbo Diesel

ENGINE

6.6L LML Duramax Turbo Diesel

FITMENT NOTE

Please verify your:

Year → Make → Model → Engine → Cooling System Configuration

before ordering.

Cooling-system configurations may vary by model, production year, drivetrain, transmission, radiator configuration, and previous modifications.

If your truck has aftermarket cooling-system components, compare the original parts, connection points, dimensions, and product specifications before purchase.

Installation and Product Videos

Reduce engine operating temperature through modifications (by approximately 20–25°F ≈ 11–14°C)!

Performance UpgradeInstallation Guide

Quickly upgrade your cooling system

Performance UpgradeInstallation Guide

OE = Weakness → Aluminum Coolant Tube = Improved reliability + Prevention of major failures

Failure PreventionInstallation Guide

FAQ

Q: What does the SPELAB Cooling System Refresh Kit include?

The kit includes three major cooling-system components:

1 × Upper Coolant Tube
1 × Aluminum Radiator
1 × Coolant Reservoir Tank

Q: What vehicles does this kit fit?

This kit is designed for applicable 2011–2016 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD equipped with the 6.6L LML Duramax Turbo Diesel.

Always verify your specific vehicle configuration before ordering.

Q: Why replace three cooling components together?

The radiator, upper coolant tube, and coolant reservoir work together as part of the vehicle's cooling system.

On an older truck, replacing only one failed component may leave other aging components in service.

A complete refresh allows you to address several key cooling components at the same time.

Q: Is this a performance cooling upgrade?

The kit is primarily designed as a cooling-system refresh and durability upgrade.

Its purpose is to replace aging factory components with upgraded replacement components and provide a more durable foundation for the cooling system.

It should not be considered a guaranteed horsepower increase or specific coolant-temperature reduction unless supported by verified testing.

Q: Is professional installation recommended?

Yes.

Installation difficulty can vary depending on vehicle configuration and mechanical experience. Professional installation is recommended, especially when replacing the radiator and servicing multiple cooling-system components.

Q: Do I need to replace my coolant after installation?

Yes.

When replacing the radiator or other major cooling-system components, coolant will need to be drained and the system properly refilled and bled.

Follow the appropriate service procedure for your vehicle.

Q: Can I use this kit on a modified LML Duramax?

The kit may be suitable as a supporting upgrade for modified trucks, but compatibility should be verified based on your specific vehicle configuration and other aftermarket cooling components.

Always check dimensions, connection points, clearance, and compatibility before installation.

Q: How do I make sure I order the correct kit?

Before ordering, verify:

Year → Make → Model → Engine → Cooling/Radiator Configuration

For example:

2015 → Chevrolet → Silverado 2500HD → 6.6L LML Duramax

If your truck has aftermarket components or previous cooling-system modifications, compare the original components with the SPELAB product specifications before purchasing.