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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?
That coolant has oxidised over time.
It needs testing to see if it will still protect your cooling system down to the required temperature. If it does not, then it needs replacing. Just about all good mechanics or good garages have that measuring device.
Dyes.............................
