My car will run at 180 degrees all day on the highway... If i get OFF the highway, It slowly climbs, i've seen it go as high as 225... I know that it is really this high, i used a real temp gauge to verify the accuracy..
I know 225 isn't technically "overheating", but it scares me. I just replaced the thermostat, radiator cap, flushed the system and it still does the same thing...
Is this normal? Am I worrying myself? or is there something else I should check..
Have you checked to see if the cooling fans are working? The module that controls them is a pretty common failure item on these years of Cads. Try turning on the A/C when the engine is warm - both fans should run.
check the a/c condensor to see of the cooling fins are blocked with bugs and gravel, those are common causes and if they are go to a car wash or in your driveway with the engine cold open the hood and spray water from inside the engine compartment outward to clean it off,