Hi Francis.
Welcome sounds like a nice low mileage diesel, as already stated check when and if the PCV was last changed, do a demist test to see if the fan is working, look up how to use the OBD, go to 19 then 7 to see if your engine is reaching its true temperature, if not then you may have the opening early thermostat syndrome, easy fix with an inline stat, as the original thermostat is a time consuming job, and can be expensive if done by a garage.
Few hose to tie back to save then getting chaffed, check the O-rings on the intercooler, check the level in the coolant tank most add to much, at the same time check the O-rings on the coolant header tank cap that they have not gone flat so are not sealing perfectly.
Ask as many questions as you like that way you will get to know your car better
cheers Arctic.
https://www.the75andztclub.co.uk/for...d.php?t=125864