1995chevy c1500 5.7 L 2wd
While driving my temp gauges started overheating I turned on the heater and the air was cool. I replaced thermostat and water pump. I bypassed the heater core until I get a new one and a leak is coming from underneath before the transmission/pan. i do not know if there was a plug or something in this area but it is a prefect hole right in the middle underneath. I cant figure this out. Should this hole be plugged or any other

