SIGNS OF DAMAGED RADIATOR CAP:
--- Leaking Coolant
--- Overflowing reservoir
--- Radiator Hose Collapse
--- Overheated Engine
--- The seal provided by the cap ensures there is constant pressure and secures control when it increases as the coolant heats up and expands.
--- Radiator caps can come in all shapes and sizes unique to your car’s radiator. Different vehicles have different systems and therefore work with individual pressures. Ensuring it all works smoothly comes down to this one little piece of the puzzle.
--- The cap also has a few other jobs, like preventing air from entering the system. If air enters the system, it can result in temperature spikes, overheating and cracking or warping in any part of the engine where the air is trapped.
--- Finally, the cap allows coolant to go to the expansion recovery tank when it gets hot, expands and pressures increase. Once the system cools, the coolant returns from the recovery tank. A malfunctioning radiator cap may cause the engine to overheat at lower temperatures or prevent the coolant from returning to the engine.