for one thing, it holds a specific type of fluid, mopar dextron. check it in neutral with the parking break on and add enough to bring it into the cross hatched area when the trans is warm. those lines do not pop off with out a reason. make sure that the hose clamps are in place and holding that hose securely.

if it slipped off then the rubber hose is old and needs replacement(same size thought). +-$1.50/ foot at any auto parts. remove the old one and bring it to the AP. cut the new hose to the same length as the old with a knife or a safety blade, tighten the clamps. add transmission fluid as needed. USE THE SAME TYPE FLUID. if the car uses TYPE V use TYPE V(just as example IDK which one you need) IF you use different one than the one you need the tranny will get damaged.

that is what your mechanic will do and charge you an arm for it.

transmission lines are usually bolted to the radiator so 'slipping off' isnt likely .. sure fill your radiator up with tranny fluid .. itl be fine ..

I assume you mean the short chunk from the steel line to the rad. If its rotted, replace all the rubber, its cheap. Use the good worm-drive clamp on the hose. (Never put two clamps on tranny lines) Top it off, any bubbles will find their way out, good to go.

Yes, add some

My transmission coolant line slipped off of my radiator yesterday and quite a lot of fluid leaked out of it; my dipstick doesn't pick up on any fluid now. I'm away at college and I don't have the money to work on it here; all I can afford to do is buy more fluid an reattach the hose until I go home for Christmas break. Would it be okay to simply add more fluid to the radiator as a temporary fix? The car still moves, but barely, and I don't want to drive it without adding fluid. So, would it be fine to just replace the lost fluid, or is this more of a risk than a temporary fix? My car is a 2000 Jeep Cherole Sport with the 4.0 and automatic tranny.