Building a Radiator Is Achievable With the Right Approach Building a functional radiator is entirely possible for a skilled DIYer or small-scale fabricator. The process involves selecting the right materials, designing a header-and-tube core, assembling the components, and conne...

The Short Answer: No, Radiator Fluid Does Not Go Between the Fins Radiator fluid (coolant) flows through sealed tubes inside the radiator — not between the fins. The fins are thin metal strips bonded to the outside of those tubes. Their sole purpose is to increase surface area s...