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All depends. If you take to the dealer it will cost you between $400 to $450 for the cooler and $1500.00 to $2000.00 for labor. If you do it yourself it will be less but you really have to know exactly what you doing. Is not easy to get to it and to replace it if never done it before. I installed mine myself on my 03 CTS, and I struggled even though I know some about mechanics. I was able to get and AC Delco for $250 cooler brand new and much better than the original. I spent around $500 total including gaskets and seals. If you can get someone to do it for you, make sure that person knows enough about this particular engine.
I hope I have provided some help with this. I have some Pics of where it is located and what it looks like.
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