A core only cools with the air that reaches it. What blocks flow without touching, why duct sealing beats a bigger core, and how the exit path decides the result.
Tight means no access, not no space. How to tell a tight fit from a touching one, what a drawing must show, and the three-question rule before ordering a part.
Moving a battery or washer bottle to clear a pipe brings constraints with it: mass and cable for the battery, gravity and filler access for the bottle.
A strut brace and a cold air intake want the same volume. How to route an intake around a brace, check clearance under load, and keep the filter out of water.
Engine movement is what breaks charge pipes. Which mounts move, why short couplers fail, and how to read witness marks before choosing a longer hose or a new route.
A front-mount core has to fit a box, not a grille opening. How to template the space, check depth against the radiator, and read crash structure before ordering.
Hardening is a material change that happens long before a leak. How to feel the difference along a hose, read surface cracks and clamp set, and judge how much margin is left.
A loose heat shield has usually lost its fixings rather than its facing. Why standoff matters, how the panel behind it cracks, and how to tell a shield rattle from other noises.
