The Land Rover 300Tdi engine has a bit of a quirk. I've owned two and they've both over heated and burst their coolant tanks. Better thermostats, water pumps and a clean radiator all help. In this video I replace the burst tank and do a few odd jobs which I've been neglecting. Replacing the coolant reservoir, or expansion tank, is a very straight forward job on the Defender - anyone can do it. I hope this video helps.

Music by Epidemic Sound
Baraka Fi Donya - Ebo Krdum
Blue Sky Blues - Peter Crosby
Frostbite - Yellowbase
Before the Midday Rain - Christian Andersen
Rock Dawg - Def Lev
Against The Grain - Will Harrison