cracked coolant line/

[dannymurphy]

first id like to say thanks to the forum and everyone who posts good advice /info
i found the cause of my heater selector malfunction was a cracked red vacume hose on the passenger side of my engine compartment near the firewall
while i was replacing it however i broke a coolant line(sigh!!) which was rusted pretty bad i barely brushed it with my arm and it shot me with a gyser of warm coolant. it is a hard line located on the left of the engine (when standing in front of the van) it is a t taht comes from the antifreeze overflow bottle and then the line splits off to the water pump (i think) and goes to a 90 that goes into the engine. the part that broke off in the rubber hose i took off and put the hose back on the part that was left. i cleaned it up a little. the part of the line that fell off however has a tapered nipple on the end and the part that i currentally have the hose attached to is about 1/4 inch I.D while the little nipple only has an opening like a millimeter or two wide

the BIG question is will this fuck up my engine because i drove it 20 miles back to my house and it workes fine but i dont know if the reduction of size is designed for pressure or something and i am concerned. otherwise the part looks fine it was only rusted where it craked and i think it might be expensive to get replaced <but im no mechanic>
thanks and sorry about the lenghty post