I have a antifreeze leak, top center of motor. something with a 10 ml bolt on 2007 Mercury Mountaineer

It looks like a wire covering running to it. I have filled my antifreeze res twice and it keeps appearing on top of the motor, it looks like there is a freeze plug in front and in the rear of it. What could it be?

Asked by for the 2007 Mercury Mountaineer
HAVE CAR PRESSURE TESTED TO CONFIRM LEAK. POSS THERMOSTAT HOUSING IS CRACKED. THEY ARE PLASTIC AND ARE A KNOWN CAUSE FOR LEAKS
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pressure test cooling system and check to see where it leaking from