Yes you do Patrick, but not entirely... A gallon or so should be enough to
lower it below the manifold level.
You *could* pull the Tstat, then keep draining coolant until you see it
drain out of the passage in the manifold...
Jon Smith
> Does anyone know if you have to drain the antifreeze to remove the
> intake on a '99 5.9L to be able to change the pesky plenum gakset?
> Thanks
> Patrick
>
>
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