Some time in the past there must have been an oil leak as the translucent tank is opaque !
I have purchased a new one so that I can see the coolant level.
But before tackling the job, is there any advice or pitfalls to avoid ?
There is a right angled connector at the lower outlet, how is this released ?

Any help much appreciated. Forty years of progress. 1972-2012

I think it’s all in the workshop manual which you can download from the Wiki page on here 👍 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
New Defender D300 90 on order so "Rory" will be going to a new home....!
1974 Series 3 Lightweight = "Millie"
My preferred specialist: www.glenrands.co.uk
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What brand did you buy? Mine needs a new one as the float hasn't floated for a while and one day when I haven't checked the level might actually be down.

DrRob wrote:

I think it’s all in the workshop manual which you can download from the Wiki page on here 👍

GraemeS wrote:

What brand did you buy? Mine needs a new one as the float hasn't floated for a while and one day when I haven't checked the level might actually be down.

Thanks Arbuckle. The price here for the genuine item makes a pattern one look a good choice.

New expansion reservoir fitted and hopefully, all trapped air pockets eliminated.
Sunny day at Easter made tinkering outside enjoyable.

What have I learned?
1) the air box needs a really strong tug to release from the rubber retainers;
2) don't drop the elbow retaining clip when refitting. Having to remove the undertray to retrieve same is annoying. Fiddlesticks, Poo, Rhubarb etc ! Forty years of progress. 1972-2012