2000 Jeep Cherokee Leaking Coolant

My JGC is leaking coolant after I turn of the engine sometomes a little sometimes a lot .My temp gauge however runs at normal 210 a few times got as high as 225-230 but inly for a few seconds while I assume my fan work faster .I checked the coolant lever the radiator level was a little low about a 1 1/2 - 2 inches from the opening. And my coolant tank was very low .The coolant tank doesnt seem to fill as i think it should .
Any ides.suggestions please ........