cooling system help?

turbo-minivan

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not so much a problem as a question if i can delete it...
on the water neck of the 1st gens (and maybe others) there is a nipple that points upwards and a hose that runs from there to the radiatr just below the rad cap area. can someone tell me the reason for this? is it simply to prevent an airlock of sorts? can it be deleted?
im building a custom project and id like to delete it if i can.
anyone have more info on this little vent/re-circulation hose?
 
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