Bruce Nunnally Posted July 5, 2011 Report Share Posted July 5, 2011 The intercooler coolant overflow tank apparently was in the 06/07 but deleted for the 08/09 STS-V. I ordered a surplus one off ebay via the Best Offer option Item name: Cadillac STS-V Antifreeze Reservoir 4.4L SC Tank 06-08 http://rover.ebay.com/rover/0/e11003.m43.l1123/7?euid=1b17d12edb474fbc9aafec0e9938a099&loc=http%3A%2F%2Fcgi.ebay.com%2Fws%2FeBayISAPI.dll%3FViewItem%26item%3D220568512999%26ssPageName%3DADME%3AB%3AEOIBSA%3AUS%3A1123 Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
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