Shop said blown or cracked head gasket,(s)

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Shop said, Exhausted gases in cooling system, cracked or blown head gasket(s). This after replacing seals 6 weeks prior. Took 1998 Old Silhouette Mimi van in for van running hot. Replaced seals 1500.00 . Six weeks later van doing same thing , running hot, . Without taking apart they gave above diagnoses and quoted 2500.00. If first repair was done correctly, shouldn't the second issue not of occurred ? Thank you