Coolant leak coming out underneath the engine in the front middle?

Hi, I have the vehicle listed above that needs a thermostat housing unit. I got somebody to put one on but right afterwards when we were putting water in the radiator the water started coming out underneath the engine in the front middle. So, the guy said it looked like I needed a water pump. Well about 6 months later I'm trying to fix it. So, I got somebody to look at it and they discovered that the thermostat housing wasn't screwed back all the way shut and water was leaking out of it. Okay, so I get this guy to fix that. But it still has a small leak coming from the same spot it looks like. So now I'm trying to figure out where it's still leaking at.