{"product_id":"performance-radiator-for-buick-rainier-2004-2007-4-2l-automatic","title":"Performance Radiator for Buick Rainier (2004-2007) 4.2L Automatic","description":"\u003ch2\u003eHigh-Efficiency 3-Row Aluminum Performance Radiator for 2004-2007 Buick Rainier\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect drop-in cooling upgrade:\u003c\/strong\u003e Replaces failure-prone OEM plastic-tank units with an all-aluminum 3-row core to maximize heat rejection under heavy load and prevent thermal runaway in the 4.2L Atlas inline-six.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Rainier Thermal Vulnerability\u003c\/h3\u003e\n\u003cp\u003eFactory GMT360 cooling assemblies rely on single-row aluminum cores crimped to molded plastic end tanks. Over repeated thermal cycles, the factory rubber gasket degrades, while continuous engine bay heat causes the polymer tanks to embrittle and crack along the crimp seam. Under sustained load or stop-and-go driving, the narrow stock core quickly succumbs to heat soak, driving up coolant temperatures and putting the Atlas LL8 cylinder head at risk of warping.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis heavy-duty unit features a 100% TIG-welded aircraft-grade aluminum construction, eliminating crimped plastic tanks entirely. The 3-row core design expands internal fluid capacity and surface area, dramatically improving convection efficiency across the 18.1\" x 26.75\" core matrix. Engineered with an integrated M14x1.5 transmission oil cooler, it ensures optimal ATF operating temperatures to protect the 4L60-E automatic gearbox from fluid degradation during towing.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2004-2007 Buick Rainier\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eAtlas LL8 (4.2L I6) \/ GMT360\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e275-291 hp \/ 275-277 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eDPI 2458 \/ CU2458 \/ GM3010420 \/ 15196385\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004 Buick Rainier CXL \/ CXL Plus 4.2L L6 Automatic\u003c\/li\u003e\n  \u003cli\u003e2005 Buick Rainier CXL 4.2L L6 Automatic\u003c\/li\u003e\n  \u003cli\u003e2006 Buick Rainier CXL 4.2L L6 Automatic\u003c\/li\u003e\n  \u003cli\u003e2007 Buick Rainier CXL 4.2L L6 Automatic\u003c\/li\u003e\n  \u003cli\u003eNote: Fits 4.2L I6 models only; does not fit 5.3L V8 configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Buick Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle elevated thermal demands when hauling or traversing steep inclines, this all-aluminum core ensures strict cooling stability and extended transmission lifespan without fluid cross-contamination risks.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50426347847928,"sku":"DS-EP3CZ6OAI","price":244.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-radiator-for-buick-rainier-2004-2007-4-2l-automatic-1.jpg?v=1788397971","url":"https:\/\/performancechiptuning.com\/products\/performance-radiator-for-buick-rainier-2004-2007-4-2l-automatic","provider":"Performance Chip Tuning","version":"1.0","type":"link"}