Anyone Know What This Green Stuff Is?

Not sure if this is something important seeping through the connection or just excessive sealer?

Has anyone ever seen this before? It's on the backside of the engine. I am supplying a zoomed out image for orientation and a zoomed in image for a better look.
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IMG_9963.webp
 
That connector is for the heater core, isn't it? The green stuff looks like hardened coolant, which is green. Why it is coming out like that is a mystery.
 

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