Performance Radiator for Pontiac Bonneville (2000-2005) 3.8L Automatic

High-Efficiency 3-Row All-Aluminum Performance Radiator for 2000-2005 Pontiac Bonneville

What it Does: Direct-fit cooling system replacement engineered to increase thermal capacity and eliminate plastic end-tank cracking on high-mileage and supercharged 3.8L engines.

The Stock Bonneville Cooling System Weakness

Factory radiators in the tenth-generation Bonneville utilize composite plastic end-tanks crimped onto a thin single-row aluminum core. Over continuous thermal cycles, underhood heat soak from the 3800 Series II engine degrades the plastic tanks, leading to stress fractures at the inlet/outlet necks and catastrophic crimp-seal seam leaks. Furthermore, supercharged L67 applications generate substantial thermal loads that exceed the dissipation limits of the narrow stock core, leading to elevated coolant temperatures and heat-induced ignition timing retard.

The Engineering Solution

Constructed entirely from aircraft-grade aluminum, this heavy-duty unit features a high-density 3-row crossflow core measuring 30-1/2 inches wide by 15-5/16 inches high. The reinforced end tanks are 100% TIG-welded to eliminate failure-prone mechanical gaskets. Featuring an integrated 11-1/2 inch transmission oil cooler and standard 1-1/4 inch inlet and 1-1/2 inch outlet connections, this 100% leak-tested assembly drops directly into factory mounts without modifications, vastly improving fluid velocity and heat rejection.

Technical Specifications

Compatibility

• 2000-2005 Pontiac Bonneville SE 3.8L V6 Naturally Aspirated Automatic
• 2000-2005 Pontiac Bonneville SLE 3.8L V6 Naturally Aspirated Automatic
• 2000-2003 Pontiac Bonneville SSEi 3.8L V6 Supercharged Automatic
• Note: Specifically engineered for Pontiac Bonneville; not compatible with Buick Park Avenue core profiles.

The Pontiac Performance Caliber

Engineered to handle sustained high-load highway cruising and high-heat conditions on supercharged platforms, this radiator provides consistent cooling fluid stability and robust mechanical durability without triggering secondary sensor faults.