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Does it fog the windows when you turn on the defroster? Are you losing any coolant? Even a small leak will smell pretty strong. Pressure test the cooling system, see if pressure bleeds down.
YES! This is exactly the issue I had. I had a buddy help me replace the heater core. Part was inexpensive but the labor? 6 hours! Thanks for all the help!! You are a great asset to this site HeyYou