lots of steam, wet hose

[socialmoth]

havent driven my car for a few months, just put a new ptu in, prior to that when i drove it i would see steam, took it for a drive today with the new ptu, (no fluids changed) and when i came to a stop there was a mass amount of steam coming out near the firewall/battery... I found no leak, no fluids and all my fluids seem to be fine, and there are no spots on my garage floor but i did find a hose that has some condensation/wetness on it, but not sure where all the steam is coming from, or what this spef hose does... so im posting pictures of the hose when its wet... you can kinda see it under everything but its on the passanger side,near the transmission distick...

<--- you can see the wet hose part, what is that, what does it do, why is it all wet? cause i dont know why

[BigTDogg (MA)]

Most likely one of the under-plenum hoses which is leaking under pressure. Get a coolant system pressure check to see where it's coming from