My car is leaking coolant, but only after it gets up in temperature. I noticed while driving from the steam coming out from under my hood. brought the car home cooled it off and cleaned it up and checked all the hose fittings. Started it up after it had ample time to cool and went a solid 10 minutes with no visible leaks or sprays. Held it at 3000 RPM to warm it up for a few minutes while I monitored. Coolant started leaking from behind the belt right after the fan turned on (not sure if coincidence or direct coloration). I think its either the water pump gasket or something with the thermostat. Any help trouble shooting is appreciated.

Thank you in advance!!