Hey 83Mercedes, I was having the same worries, only I at first did have a wter pump going out and a bad thermo, and then found tht the radiator was leaking. After $400 and repairing and replacing all of those items I was and am still at 90-100 sometimes a little over 100 if in traffic with the A/C cranked up high (coming out the side vents only thanks only to my tolltag wedged under the arm of the actuator in the glovebox
.....NEXT PROJECT...hehe) I have come to the conclusion after reading on and on that I just need to get over it and if it ain't in the red just keep movin'!
After always used to have driven Caddys and Lincolns
I guess the temp guage just kinda jumped out at me in the Benz when I know that 100c is at boiling.