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Coolant light comes on

The frost plug was replaced twice and still the leak continues. Has this been a problem with other Suburbans?

Not a problem on any car made. What location is the offending plug in? What type of replacement are you using? Quantify the leak (1 drip per minute,or) various plug types to try if the engine block surface is damaged and won’t seal.

Not using a disc type when a cup type is called for are you?