Radiator Universal Double Pass Closed 31x16

The PWR NORTH AMERICA Radiator Universal Double Pass Closed 31x16 (Model 904-31162) is a high-capacity aluminum cooling solution engineered for custom vehicle builds and high-performance cooling applications. This dual-pass radiator delivers superior heat rejection through its proven double-pass design, which maximizes coolant flow efficiency and thermal transfer compared to single-pass configurations. With passenger-side inlet and outlet ports, it integrates seamlessly into applications where OEM radiator footprints require a direct replacement or custom fabrication.

The 31-inch width by 16-inch height dimension accommodates mid-size engine bays while the compact 1.75-inch depth allows flexible mounting in space-constrained environments. All-aluminum construction provides excellent strength-to-weight ratio and superior corrosion resistance compared to older copper-brass designs, critical for vehicles exposed to salt air, winter road treatments, or high-humidity climates. The closed-tank design maintains system integrity under pressure, preventing coolant loss and reducing maintenance intervals. At 32 pounds, this unit offers substantial cooling capacity without excessive weight penalty.

This radiator serves street rod builders, vintage car restorers, and custom automotive builders seeking bolt-on cooling solutions that exceed OEM performance. It's equally suited for off-road enthusiasts upgrading cooling systems in lifted trucks or vehicles operating in demanding terrain. The universal design appeals to fabricators developing engine swaps or performance builds where cooling capacity must scale up to match higher heat output.

Double-pass radiators are industry-standard in performance cooling because they force coolant through the full core twice, maximizing temperature drop in a single pass through the engine block. Natural (unpainted) aluminum finish provides a clean appearance while resisting oxidation better than painted alternatives in engine bay environments.