There may be air trapped in the system preventing it from filling properly. Start the engine and (carefully) squeeze the larger coolant hoses. This may loosen air bubbles.. As it's a diesle it will not warm up idling.. So
Carefully check coolant : and top up if needed.
Short drive 3 miles.
Check coolant agin..
Leave to cool before topping up - if you open coolant cap when hot you risk danger of scalding water burns.
And continue until coolant level is stable.
I trust you are using the correct antifreeze mix?
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