How to replace thermostat - Fiat Ducato 1992

How to change the thermostartbon a 1992 fiat ducato, hymer B694 motorhome. But all is relevent to most vehicles, maybe not new cars due to all the electronics etc, but older style cars.
I am not a mechnic, but thuis is a simple little job. Anything you might have to add, please feel free to comment so we can all learn.
Would love for this channel where people can help others with jobs like this and more. Help me make a great place to be.
motorhome_life

[@paulfoster238]

Bleed for the system is usually a small tap to the left hand side of the heater box under the bonnet. Good luck with your channel