Thats if your plastic overflow tank has not already cracked and started leaking.
They seem to be failing at this age.
Ford no longer makes the early style ones, could not find an OEM aftermarket one either, but eyeing the aluminum one Classic Diesel Designs sells.
Replace your faded, cracked factory reservoir with our remote mount unit, comes with an o-ring sealed billet cap and mounting brackets, this allows flexible mounting options, with it commonly mounted off the radiator fan shroud mounts or core support to open more room up for cold air intakes and...
classicdieseldesigns.com