Radiator/Coolant Stop Leak Products

[wolfe10]

Originally Posted by rssnape

I would investigate if you can determine the location of the leak before I put stop leak in.

No question, this is the best answer.


Find and solve the problem, vs just masking it with something that could potentially obstruct smaller passages in your cooling system.

[shootist]

Originally Posted by 1972VWbus

Going to depend on how big the crack/hole is. But the only one that works well consistently is...

https://irontite.com/p/8197-all-weat...al-pint/v/8197

The great thing about this stuff is you put it in and leave it in. It dissolves to a micro-emulsion that doesn’t clump or settle so there is nothing there to clog your system. Activation only happens when both heat and air, under mild pressure, is encountered by the solution.

So if it needs air it won’t work for a oil to coolant problem.

[153stars]

The coolant filter on wet sleeve motors is used to slow release nitrate and molybdenum additives that prevents cavitation pitting of liners. Test strips should be done yearly. New OAT coolants may or may not have nitrate additives but has longer service life without adding additives. I believe you can run with the filter closed (there is single tube valve with a knob at each side) and not impede the actual cooling.
There's ton of threads to read up on.
I worked for large rental store early 80s. The Father taught me to repair radiators. It was about when plastic alum. radiators came out. We had a crimp tool it worked 25% of the time but those early ones were terrible for tank leaks. I think it was poor gasket material actually. We replaced many with copper. Decade later I seen them twisted in wrecks not leak a drop and go 300k miles in daily driver.

[1972VWbus]

Originally Posted by shootist

So if it needs air it won’t work for a oil to coolant problem.

The product is only for radiators. It only 'activates' with heat, air and mild pressure. Without all (3) it won't activate.

[veraken]

Here is a Zerex stop leak product authorized by Cummins

https://www.napaonline.com/en/p/ZRXZXC03