Hi there,
If the heater hoses go through the fire wall before attaching to the heater core, they very well may be the problem, or in fact the heater core may be leaking as well, you will have to pressure test the system, and carefully inspect any hoses under the dash and the heater core if at all visable for leaks.
Mark (mhpautos)
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Wednesday, July 29th, 2020 AT 10:10 AM