ok coming in late here, but 'coolant' is generally primarily concerned with two functions. Antifreeze & anti corrosion properties. Both of these tend to fall off after a while hence replacing the coolant every couple of years is a good idea.
So if your bike gets hot it isn't really the coolant's fault. If it was showing 98deg then there could have been some localised boiling so expansion is likely. Most fans won't come on till after 100 degrees for some crazy reason.
If it gets really foul from corrosion then heat transfer will suffer.
Some coolants contain 'water wetter' to thin viscosity that helps cooling, but typical gycol ones won't.
Don't you look at my accountant.
He's the only one I've got.
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