My discovery 2004 is leaking coolant not overheating or anything... ?

if there is a tee there,then someone put it there for flushing purposes or was installed at the factory,let it get to operating temperature,turn the heater on hi(i can't do that here in NC,it's 87 degrees outside at 6:15 pm)i see it's 41 there!.if it's got the screw type clamps,they may be loose or hose is cracked/dry rotted.