Stop leak additives may seal the pinhole leak in your radiator, but they may not deal with the source of the damage. ... If there are multiple leaks, or if there's a leak in an area that radiator stop leak can't seal, it's time for a replacement radiator.
What's good for a radiator leak?
One of the easiest ways for a consumer to address a radiator leak is to pour a bottle of AlumAseal® Radiator Stop Leak and Conditioner into the radiator. This liquid sealant product is a convenient and safe way to fix radiator leaks.
Will radiator stop leak harm my engine?
In the end, off-brand products could possibly damage your engine – we hear stories about it on a weekly basis. When you carefully follow the instructions for our engine, radiator or other stop leak products, there is no risk of damage.May 17, 2017
Over time what happens is the stop leak product that was put into the cooling system starts to break down, dry up, and break apart, causing debris and potentially even a large clump to go free-falling into the cooling system.Mar 25, 2021