Quote Originally Posted by techinspector1 View Post
I think I'm right on this, on any modern auto trans, the out line is the one closest to the pump. As far as plumbing to the radiator, I have no idea what is correct, but here's my thinking.....
1. I don't want to overcool the trans fluid. It has to be pretty hot to operate properly, so I would want to cool it to the hottest part of the radiator.
2. If you're pushing fluid vertically, it makes sense to me to introduce it into the bottom fitting and bring it out the top fitting to prevent air in the system.
Bottom line: call the radiator mfg.
See that's what I was thinking about. I don't want to get air in the system. Obviously I would fill the cooler up before I hook up the top line and start the car, but it seems like pushing the fluid up and out the top fitting would prevent any chance of air.