I have 2012 2.0,estate diesel I have an issue with the cooling system, message on dash when I turn engine on coolant low top up, well done this, still there checked for leaks looking good, checked float and put new one in still there, but the thing is the coolant level as not gone down since I topped it up to the level of mark on bottle and car temp seems to be OK comes up to running temp in around 5 min but never go's over 90 on clock any help on this would be great as I need to use the car for weekly hospital appointments

May be worth checking the level on a flat surface when the engine is cold and if still comes on then try adding some more coolant/water to bring it up near the top line (max) rather than the lower line (min).

Had an issue on a Nissan Juke when it said brake fluid low - checked it looked fine, added the smallest amount of fluid to the reservoir and the light went out.

Sorry for late update on this  I ended up changing the resoviar and low and behold message gone on looking in side of the old one the float was not working so happy days thanks for any reply n this