Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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I do not see any recalls or service bulletins for this condition concerning a head gasket.
However, there is a bulletin for a possible issue with the coolant and transmission fluid mixing. Check the atf and make sure it's full if possible. It's quite likely there isn't any sign of a head gasket problem because the head gasket's not the problem. It may be mixing atf in the radiator. This will lead to transmission issues, and a code and possible speedometer not working issues as well.
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Looks like the radiator is close to $400 and 2 hours labor if you have the dealer do it, plus coolant. You will also need the transmission fluid flushed as well. I would ballpark this at about $600-$700 repair.
An independent shop could likely do it for less.
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