Well, my 1990 300e that had blown a headgasket with 215000 miles on it just came back from the shop. We were going to sell her but decided to hold on to it a while longer(I hope). The job included reworking the head, new timing chain and tensioner, new thermostat, waterpump and radiator. The question is it seems to run a little warm. My wife drove it home with the a/c on open highway and the temp was on the bar bt. 80 and 120, I would think, logically that would be around 100 degrees. Is that correct? I have read posts that indicate the temp should be around 90. Should I be concerned?