Your air blend door is stuck shut.....The HVAC system has doors in the passage tunnels where the air blows through...The doors are operated by actuators sometimes they will fail but normally the doors will break at the hinge or wear out enough to make it **** sideways and stick half way....
Since you are getting cold air you are just getting vent air from a seperate tunnel...You might could get a diagram picture of it from google to give you an idea what I am talking about it you do not know....The bad thing is you will have to get a dealer to scan the HVAC system to see which doors or door actuators have failed...also you have to remove dash to repair......It is not an easy task .....
Just tell the technician that you think the heat/cool blend doors are sticking or the actuators are not working and he should know what to look for.....Hope this helps................Metalpoet
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