I have a 2006 2.8 JTD Ducato Maxi and also need to drain the coolant to replace thermostat.
Removed the intercooler hoset top of engine and airbox hose.
I just removed the Front grill and left hand side headlight.
Finally, i can see the radiator hoses.
However, I do not see a drain plug or bleed screw so confirm Freespirit's comment.
I am astounded at not seeing a bleed plug at least unless it is well hidden?
The bottom hose and clamp is still not easy to get to.
Did you remove the front bumper and/or the radiator fans and shroud
before removing the bottomhose?
Did you start with the top hose first?
I want to catch as much coolant as possible...without drenching all those sensors and connectors.