Sorry I don't think I gave enough info as far as the diagnoses. I was eager to fix the problem. The elbow closest to the water pump is the one that went bad, although I replaced both now. It appears as if the o-rings had both worn out, but when I had the system pressure tested for leaks, that elbow cracked to the point of literally spraying coolant. Before, it was leaking so slowly that any coolant that came out must have been burned off before I could see evidence. That's why I couldn't find any leaks and why it was taking around a week to start acting up bad. By the time I got back to my house after pressure testing the reservoir and part of the radiator was drained. I just finished replacing both elbows(with aluminum ones). Will be taking it for a test drive in a few minutes and will report if I have any more issues. The fact that it just busted open under light pressure(pressure testing started and it nearly immediately cracked at the bend) and that the o-rings were eroded away leads me to believe that was the problem.Originally Posted by 99GT2dr
