My '84 W123 300D (n/a 617 motor) seems to be running a little hot. It hasn't overheated, yet, but consistently is above 80C on the temp gauge. I haven't driven this car a whole lot, so I'm not sure if this is de rigeur for this motor. My TD and SD (both turbocharged) stayed right at the 80 mark, occasionally creeping a bit higher. I changed the coolant and flushed the radiator... think I chould pull the water pump and inspect the impeller? The car sat for a few months this winter, so I, honestly, can't remember where the needle on the gauge sat before. Anything to be (overly) concerned about??