2001 Kia Sephia Q&A

2001 Kia Sephia Question: Coolant leakage

There is a round metal tube that appears to be attached to the back of the thermostat housing and is located above the starter, its been leaking for a while the tube looks pretty well rotted out, and I have been told by my mechanic that it is built into the head and cannot be replaced, I find that hard to believe, the leak has ruined a starter, the car runs great, body is in pretty good shape, I don't want to junk it because I can't get the leak stopped. Can you help me. Its leaking almost a gallon a day, that is the only place it is leaking. The metal tube also has a small hose that appears to go to the heater core. Can you help. -
Answer 1
SEEK A 2ND OPINION FROM ANOTHER MECH AS TO WHAT YOUR OPTIONS ARE -
Answer 2
If you cut the leaking part of this pipe off, is there enough left to put a longer hose on it to fix this problem? -