1. Game Items
2. Fallout 4 Item ID List
3. Coolant Cap

The Coolant Cap is a miscellaneous item primarily found in old, abandoned vehicles and garages scattered across the wasteland. It's a small, circular object, reminiscent of a car's radiator cap, and serves no immediate purpose on its own. However, it can be sold for a small amount of currency or used as a component in crafting and modifying gear, making it a useful find for players who engage in these activities. Its value lies in its utility for crafting rather than any direct application.