Quote Originally Posted by Dieselholic92 View Post
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.
It cannot "get airbound".. above the fluid reservoir, it's all air other than the valve body. After the pump raises the fluid pressure it sends a portion of the fluid over to the cooler and then it's back to the reservoir. All the older trannies had vented to the atmosphere cases. Heat will kill an automatic. No matter how you plumb it, you gain some cooling, if you're that worried about it add an external cooler after the radiator cooler.