If you have the blue (as opposed to the orange) antifreeze you can just add
regular ethylene gycol antifreeze to the coolant to bring the strenght up.
However as its now 3 yrs old, you would be wise to drain, flush and refill
with fresh coolant (50/50) as the corrosion inhibitors in the blue coolant
'wear out' after around 3 yrs.
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I'm glad you said that because I was wondering how your 2000 Ford had
the old blue coolant when my 2 1999 Fords have the later orange coolant.
To answer you question, the orange coolant doesn't ever need replacing
because the corrosion inhibitors don't deteriorate. You should always
use the orange coolant when topping up. Never put the blue stuff in.
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