Problems with overheating on 2002 Oldsmobile Silhouette

Just had intake manifolds replaced due to antifreeze leak; now Im being told exhaust is leaking into the coolant system causing the vehicle to overheat. What needs done now to repair; any ideal of cost. Any help would be greatly appreciated.

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1 answer
could be cracked head or headgasket 3.4 engine or replace engine be cause sometime you can not find a crack in a head or a bad headgasket best to repace heads with new ones