2011-2016 Chevy GMC 2500 3500 6.6L Duramax 5 Row Extruded Tube Aluminum Radiator

2011–2016 Chevy/GMC 2500/3500 6.6L Duramax | 5-Row Extruded Tube Aluminum Radiator

LML Duramax. More Power, More Torque, More Reason to Upgrade.

The 2011–2016 LML Duramax is the most powerful factory Duramax of its era, and with that power comes proportionally higher thermal demands. These trucks routinely see heavy fifth-wheel loads, SCR-equipped exhaust systems, and performance tunes — all of which push coolant temperatures harder than the factory radiator was designed to handle long-term. The standard aftermarket aluminum radiators on the market offer brazed construction with TIG-welded end tanks only, which is a marginal improvement at best.

This 5-row extruded aluminum radiator is engineered specifically for the 2011–2016 Chevy and GMC 2500HD and 3500HD with the 6.6L Duramax. It mounts directly in the factory location with no cutting, no drilling, and no fabrication required.

Done replacing radiators? So are we.

Most aftermarket aluminum radiators — including well-known brands — TIG weld only the end tanks and rely on brazed joints where the core meets the header. That junction is exactly where they crack and leak under diesel heat cycling and vibration. It’s not a matter of if — it’s when.

Fluidyne eliminates that failure point entirely with a fully extruded aluminum core — a single-piece design with no brazed tube-to-header joints anywhere in the core. Every tank, fitting, and seam is finished with premium TIG welds throughout. The result is a radiator that is genuinely heavy duty, built to last, and engineered to be the last one you ever put in this truck.

Five rows of heat rejection, sized for the LML engine bay.

With a 33.5″ core and 27.75″ core height, this unit is built to fill the available space in the GMT900 engine bay and maximize heat rejection capacity within the factory shroud setup. The fin pitch is optimized for factory airflow so you’re not chasing fan clearance or spacing issues.

Fitment: 2011–2016 Chevy/GMC Silverado/Sierra 2500HD / 3500HD | 6.6L Duramax (LML) | Crossflow | 33.5″ core