Yes, good diagnosis! AC condensate.

 

I don't understand why BMW would decide to put the AC drain above the transmission. The car is 17 years old, so I guess it hasn't done any damage.

 

I just deleted my CCV and installed a catch can. Just did a smoke test and found all connections were leaking tightened them up and no more leaks. Guess I'll have to keep checking the clamps for a while on the new hoses.

 

On an e36 there's a tube that runs down the passenger side parallel to the trans; weird they wouldn't carry that over

 

That condensate coming from the top of the transmission has caused the edges of my transmission pan to rust, enough to make it a pain whenever it's new filter time. You can see it on most ZF tranny pan pictures. Like so -

 

I just changed the fuel filter, so I started the car to check for fuel leaks. I took a few minutes to use my scanner before heading under the car to check for leaks. Nice humid day so the AC was working hard. When I got under the car on the lift, I found a nice puddle of water dropping down from the rear of the tranny.
It was coming down from the top of the tranny, running down the outside of the hole just forward of the cross member. It was not engine coolant, so I assume that it is the AC condensate. Most cars that I have experience with, the condensate came from the firewall area between the engine and the right front wheel. Is this normal for 330Ci's? Something to investigate or do they all do that?

Yes, the AC condensate drain is on the passenger side, forward of the foot well, and near the center line of the car. In a perfect world, the hose would hang low enough that the important stuff in the area would not get wet.