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I am mechanically inclined, as my father and his two brothers are all professional engineers in the automotive industry. I do most basic maintenance myself. Re the rad, I noticed there was a coolant leak, refrigerant (rf134A)leak, and the brakes were rough when I test drove the car. That's why I specified these items in the letter of offer, and paid express attention to these items. Problem is, the dealer topped up the fluids rather than pressure test the systems to find the cause of the leaks. The rad had a crack in the upper neck, which seeped vapour under pressure, and is what eventually blew. There was dye oozing out the three ports in the condensor, and I did not put any dye in. So yes, I noted each issue prior to purchase, asked and received confirmation that each had been fixed, only to find that a sloppy patch rather than repair had been implemented. There is a big difference between items that fail, and items that were part of an agreement to be fixed prior to purchase and were not, and failed afterward. Hope this makes sense.