Performance Radiator for Chevrolet Trailblazer (2002-2009) 4.2L
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Heavy-Duty All-Aluminum 3-Row Performance Radiator for 2002-2009 Chevrolet Trailblazer
What it Does: Replaces the failure-prone factory cooling assembly with an all-aluminum 3-row core to maximize heat rejection and fluid capacity under heavy load.
The Stock Trailblazer Thermal Fatigue and End-Tank Failure
Factory GMT360 radiators rely on crimped plastic end tanks mated to a single-row core with rubber gaskets. Prolonged heat cycling causes the plastic to embrittle and crack near the upper inlet neck, while the crimp seams degrade and blow out under cooling system pressure. Furthermore, the limited stock core volume struggles with thermal dissipation during towing or continuous high-load driving, inducing critical engine and transmission heat soak.
The Engineering Solution
Constructed entirely from aircraft-grade aluminum, this direct-fit radiator features a high-density 3-row TIG-welded core (18.1 in H x 26.75 in W) that completely eliminates bonded plastic seams. TIG-welded aluminum end tanks withstand high pressures and severe vibration. An integrated M14x1.5 bottom-tank transmission oil cooler regulates 4L60E fluid temperatures, maintaining continuous cooling performance under severe operating environments.
Technical Specifications
| Fitment | 2002-2009 Chevrolet Trailblazer (4.2L Automatic) |
| Engine / Chassis | Atlas LL8 (Vortec 4200) / GMT360 |
| Stock Output | 275-291 hp / 275-277 lb-ft (Approx) |
| Core Dimensions | 18.1 in H x 26.75 in W (3-Row Core) |
| Inlet / Outlet | 1.30 in / 1.57 in |
| Transmission Cooler | M14x1.5 Threaded Fittings (Bottom Tank) |
| Interchange Part Numbers | DPI 2458, CU2458, Q2458, RAD2458, 432403, 21505, GM3010420, GM3010449, IZ3010147, 52381210, 15196385 |
Compatibility
- 2002-2009 Chevrolet Trailblazer (4.2L L6 Vortec 4200 Automatic)
- Note: Fits 4.2L Inline-6 models only; Does not fit 5.3L or 6.0L V8 models.
The Chevrolet Durability and Towing Standard
Engineered specifically for the demands of GMT360 truck platforms, this cooling system upgrade withstands heavy payload capacities, sustained mountain grades, and extreme ambient temperatures without fluid degradation or structural fatigue.
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