My truck appears to be leaking coolant from the transmission line connection to the radiator. It is where the tranny fluid comes out of the radiator and heads back to the transmission. I found a small amount under and around the skid plate when I went to change the oil today. I let it warm up and saw coolant leaking from this fitting. Has anyone experienced this? Does the transmission fluid just circulate through the bottom of the radiator? I wanted to loosen the nut to investigate but I don't have any good diagrams of the radiator and want to know what I'm getting into here.