For starters, there isn't any coolant line that runs to the intake manifold. I am assuming you're talking about the coolant line that runs to the side of the throttle body that is right in front of the #1 fuel injector? If so, get your fingers in there and line the tube up. I usually use a pair of long 90* needle nose pliers but I would imagine that any needle nose pliers will work.
If you're not talking about the above coolant line, a pic of the coolant line you're talking about would be useful.