2006 Sonata fan works, no heat, new thermostat

What is your question?

I have had my 2006 sonata in X3 to fix the heater, fan works, sensor and thermostat have been repaired, all wires are connected, but no heat, the shop told me that if I have it on "auto" it will adjust the interior temp, but no heat is coming out

What makes this problem better or worse?

nothing, just no heat, cold air blowing

How long has your 2006 Hyundai Sonata had this problem?

2 months