So you are saying it is a heater core leak? 2X my mechanic has taken out part of the heater supply line and spliced it to stop the leak...(using a rubber hose) I can not smell coolant or see any on my floor boards. Since you are a chevy guy, thought i would also ask about my "dog Bones" they were replaced at the same time, but now, one seems to be worn and not the other??? That Camaro of yours sounds like a jewel! Shades of my High School years! OOPs! looks like I got one too many zeros in my mileage, 202,000+