GM Coolant tabs- How to use ?

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I know you crush them, that I add about 1-2 oz per qt but where / how do I add them?

As dilluted in a pint and add to reservoir?
Or radiator fill cap when cold?
 
Not new or when you change japanese engine's coolant. It would be one solution if leaks develop and you're sure its the radiator.
 
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