Leaking anti freeze from somewhere around the back of the motor?

I’ve checked the heater core doesn’t seem to be leaking, it isn’t the hottest as it should be. I guess and I check the freeze out plugs no wet spots, but no leaks. I can see in the inside the hoses on the outside isn’t wet around them but underneath the intake there’s a little coolant, I can feel under it. I’m puzzled on what it could be really. Car isn’t really over heating but does seem like it heats up a lot quicker, keeps the fan running constantly and only leaks while running, it runs down the side of the transmission. Thanks in advance for the help.