Performance Radiator for GMC Envoy (2002-2009) 4.2L

Heavy-Duty All-Aluminum 3-Row Performance Radiator for 2002-2009 GMC Envoy

Direct Cooling Upgrade: Drops engine operating temperatures and eliminates failure-prone plastic end tanks on the 4.2L inline-six GMT360 platform under heavy load and towing conditions.

The Stock Envoy Cooling Bottleneck

Factory GMT360 radiators rely on crimped plastic end tanks paired with thin, single-row cores that deteriorate over repeated heat cycles. Under sustained engine loads, high ambient temperatures, or towing, the high-compression Atlas LL8 inline-six quickly reaches thermal saturation. Over time, OEM crimp seams develop micro-fractures, and plastic tanks become brittle and crack, leading to rapid coolant loss and potential automatic transmission cross-contamination from failed internal cooler lines.

The Engineering Solution

Constructed from 100% TIG-welded aircraft-grade aluminum, this performance unit maximizes heat rejection with a dense, 3-row furnace-brazed core measuring 18.1 in H x 26.75 in W. Solid aluminum end tanks replace brittle composite materials, eliminating failure-prone mechanical crimps and gaskets. An integrated M14x1.5 internal transmission oil cooler maintains optimal automatic transmission fluid temperatures during extended hill climbs and severe duty.

Technical Specifications

Compatibility

• 2002-2009 GMC Envoy 4.2L Inline-6 Automatic
• Interchange: DPI 2458, CU2458, Q2458, RAD2458
• OEM Numbers: GM3010420, GM3010449, 15196385
• Fitment Note: Designed for 4.2L I6 models only; does not fit 5.3L or 6.0L V8 platforms.

The GMC Durability Standard

Engineered for sustained thermal control and heavy towing duties, this direct-fit aluminum cooling upgrade ensures your GMT360 powertrain maintains stable operating temperatures in the most demanding environments.