In the Summer I would go to the bank and while waiting in line i'd notice the temp gauge rise almost into the RED, but not quite. However when I got out on the road and was moving the temp moved back down to around 80-90 range. I haven't noticed any need for coolant. It worried me that this it would rise that high on while idleing. I do watch it all the time but here lately it's been fine with the cooler weather.