I guess there are a lot of early models falling into the hands of those who can't leave well enough alone. About time! It's just there's been a bunch of this subject lately.
Anyways the coolant is circulated though the throttle bodys to prevent ice from forming on it during the winter in colder climates. If you drove at a steady highway speed long enough the ice could build up enough to choke of airflow altogether and stall the engine until it thaws. At least that's what the book says, I live in Texas and don't know anything about all that. I bypassed mine as soon as I saw it and reduced air charge temps. Never noticed any drawbacks, if anything it improved things. '91 and up doesn't have them so were they ever necessary?
I dug through a box and found a double nipple hose splice to join the two hose ends together below the throttle body.
Vernon