Unknown Coolant Leak

quick question, I have a 2012 mustang 3.7 liter.

coolant leak, it started as a small leak, but now its leaking every time i start the car and run it for a while. It doesn't leak when the car is off and parked however. Thinking it may be the thermostat housing unit, or maybe water pump, hose maybe?? But does anyone have any suggestions as to what it could be? Thank you!!
 
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quick question, I have a 2012 mustang 3.7 liter.

coolant leak, it started as a small leak, but now its leaking every time i start the car and run it for a while. It doesn't leak when the car is off and parked however. Thinking it may be the thermostat housing unit, or maybe water pump, hose maybe?? But does anyone have any suggestions as to what it could be? Thank you!!

Do you know where it is leaking at? It could be any number of places, although there should be some evidence somewhere.
 
I finally had a chance to take the plugs out and take a look today. It doesn't look like any of them have any issues to me. Do these look normal? They grey stuff is nickel anti-seize BTW.

I also checked around the water pump and did not find any wet spots. I may try to pressurize the system and see if I can find any leaks.

driver plugs.jpg
pax plugs.jpg
I had a similar issue the heater hose under the intake manifold. (In the valley) was dripping at the elbow then just sitting in the valley and baking