how much does it cost to repair air conditioner over flow on 2008 Chev cobalt

You will need a diagnosis first. Then a shop can quote you on the job. Use this link to find a good shop near you. https://repairpal.com/repair-shops Alex

The a/c condensation drain tube has become clogged - vehicle will need to be hoisted to clear drain tube. At the shop we charge $20.00 for this little job. Price will vary Greatly

Usually less than $50.00