My 97 A4 2.8 has a little over 211K, and it has recently sprung a major coolant leak. (About 2quarts/25miles). Upon inspecting the very visible leak, I cannot really see it, but it is pretty centered right behind the radiator. Is it possible that the leak could be coming from an oil cooler? That is the only thing that I can see. If so, is that something that I can replace myself? I am pretty mechanically inclined and fix most other things myself. How much of the car will I need to disassemble?