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Sounds like a bad thermostat. Check that first.

It could be a blown head gasket or cracked head too. How hot did it get ??? Very low coolant level (check in the radiator when engine is cold) will give both of those problems at the same time.

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15y ago
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Q: What is wrong with your 1999 Suburban if the heat is blasting cold and it is overheating?
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