So im replacing my radiator and i bought the quick disconnect tool for the lower trans line it came off easily with it but it will not go back on...from what i read it goes back on easy...anyone got any ideas why its not?

 

an o ring came with the new radiator i did put it on the elbow thing going to the line..is that correct?

 

I'm having the exact opposite problem, I can't get mine off. I have triedeverydisconnect tool I have does it take a special one?