I have developed a leak on my 85 300sd (cali version) and i think have been able to trace the small but steady stream to a small hose connection that leads into the bottom of the radiator. the fluid is red but i don't know if this is a transmisson cooler line that i've read about on the forum or if it is something for the power steering. I am looking for input if this is a easy fix or at least what it could be so when i take it to my mechanic i have a clue of if he's trying to upsale more work on me.

Thanks in advance.
(attempting to add pictures)

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