When removing the radiaor cap I beleive the coolant should be a clear colour, in my case a clear pink colour.
However looking under the radiator cap, as you can see in the picture, I can see a kind of brownish top layer. What is this/is causing this? There was previously green coolant in then so I imagine it could be a mix of the green and pink however shouldnt then it all look that colour rather than just that top part?