1998 E300 Turbodiesel running hotter than it used to

[McCool300TD]

Hi all

I have a 1998 E300 Turbodiesel and it is running a little hotter than it used to. I gunned it recently on the motorway up to 110mph and the temp guage was starting to rise to near 100 deg so i backed off.
Have been keeping a watch on it and if i sit at 60mph it sits just below 80 deg C at 70-80mph it sits at 80 deg C progressively rising as the speed increases, this is with ambient temperature of 15-20 deg outside.

Car has had genuine coolant changes every 2 years and is clean as a whistle inside. New water pump was fitted about 30K ago due to inpeller breaking, new thermostat fitted at same time. New genuine fan clutch fitted in March this year and it works!!! Aircon additional fans are both working etc etc. All parts used are genuine parts.

Anyone any ideas on what it could be?? Doesnt use any coolant.

Had a good look yesterday and the rads all seem clean no dead flies blocking fins etc. One point of note, where does the hot air once it has been through the rad exit the car, there is plenty of room for air to get into the engine bay but not much room for it to escape with the noise encapsulation etc.

Car used to stay rock staedy just below 80 deg C no matter what speed i travelled.

Wary that maybe something is starting to go wrong.

Thanks in advance guys.

McCool300TD