Bit of an odd one. My 190e drives very well and in general driving the temp gauge never goes over half way. However I was stuck in the north circ on a hot day in solid traffic (almost same place with heavy traffic idling alongside, there was a crash or something further up) and after a while the temp gauge creeped up to 3/4 which was concerning. The magnetic fan thingy kicks in fine and the temp switch is fairly new. Doesn't use any water/coolant at all. Any thought why this could be, or is this normal? Oh and it has a/c but it hasn't worked for a few years, this means it has the extra 2 electric fans - maybe these should kick in when very hot.