I have a leak on the drivers side of the radiator?

If you have a leak on the driver's side of the radiator where the cooling line goes into the top of the radiator, it's likely related to the transmission cooler lines.

I apoligize. I thought you were talking about the part that is inside the radiator. That part has a big nut that attaches it inside the radiator and will leak coolant externally and it looks like the nut can be tightened or resealed but it cant. I try to answer as accurately as possible with the information I am given. I assumed you were leaking coolant, not transmission fluid. My mistake. I should have asked you for a better explanation. We do try our best to give fast accurate answers and unfortunately something like this happens. Again I apoligize. Tim