Coolant leak

I had to replace the heater (y-hose) on the back of the engine as it split and broke. Prior to changing, wife noticed temperature going up but not getting into the red zone, so she turned it off. That is when I noticed the hose split. I now have another leak but can't seem to find it. The engine temperature does not go more than half-way (safe zone). I jacked the car up and water was still flowing onto the transmission from what appeared to be the back of the engine onto the ground. It was flowing pretty good. I filled the reservoir when I got home and cranked the car and waited to see it flow out onto the ground. It took about 10-15 minutes before I started seeing it flow onto the ground. I looked from what little I could see at the rear of the engine and could not see a leak but I did see puddling where it was flowing onto the transmission housing. What else can I look at in order to determine where it may be coming from? If the engine is not running, I can fill the reservoir and it stays where I filled it. I also noted it to be intermittent. Once I jacked the car up from the front, the flow appeared to be slower.