heating core

change heater core or try raditor stop leak like barrs stop leak

That is a sign that the heater core is leaking. Your best option is to replace it.

Is it smoke or steam? Does it smell sweet? Hater cores on these aren;t too bad but still over $500.00. Do you have to add coolant? Give Dublin Auto a call and tell Jon what's happening. Good luck and Happy HOlidays.