I have read all the cooling system posts. The only thing I am missing is the clutch fan (The previous owner put the dreaded Flexilite on). I have a good shroud, and have sealed the top and bottom of radiator/frame gaps to ensure air comes through the right way. Car used to run right at about 190 stopped/180 moving, but I just got the A/C fixed and with hot Houston weather (90++) it runs about 200/210. When stopped for extended times (more than normal stop light) with A/C on it got up to about 220. I shut the A/C off and temp came back down to about 210. I am going to move from 50/50 mix to 25/75 this weekend and clutch/ stiff fan ASAP. The question is, and keeping in mind the slight temp spike when you shut the engine down, as a worst case, at what point should you shut the engine down because you are risking damage???