Coolant leak

I have a 1995 Chrysler Lhs overheating I replaced the thermostat the water pump and lower hose brand new its leaking from the middle of the car where the pump goes I opened it up again and installed it with new gasket and the silicone seal that its used also I have seen the radiator steaming it runs fine for two days three then I have to refill overflow tank and sometimes it leaks water sometimes it doesn't. The fans do come on I tried the 10 minute flush and it worked I think it didnt overheat but loosing coolant I just added some when I got to work and parked car leaked a little bit from under the hood toward the middle sometimes it does it sometimes it doesn't.