Electrolysis Products that work
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The coolant that we drained out was green, yet the radiator is showing dirty brown.
The residue from old spent coolant can "hide" in the block and harbor acids that allow and encourage electrolysis.
The electrolysis has found a weak spot on the middle of the radiator core as shown by the discoloration.
The cooling system had a measurable voltage of .6v. This radiator was about 2 years old.
90,000 miles. Coolant never changed.
Black area at bottom left of heater is where leakage was occurring.
Had .56v. The coolant was almost black. It took almost a week to reduce the electrolysis. Look at the sediment at the bottom.
Leaks near inlet tank. Radiator less than 1 year old.