Most likely the intake gaskets are shot. Very common problem on the GM 6 cyls. Don't put Dexcool back in, as that is the reason for most of GMs cooling system failures. Have it flushed to green, or Prestone long life that is not Dexcool.
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Most likely the intake gaskets are shot. Very common problem on the GM 6 cyls. Don't put
Dexcool back in, as that is the reason for most of GMs cooling system failures. Have it flushed to green, or Prestone long life that is not Dexcool.