My ac was working fine then one day it stopped and now only hot air blows out the mechanic said the ac is fine and works good but there is a vent door that switches the ac to heater and he said it was...
There is a blender that controls the air flow to go through the heater core for heat, and the evaporator for AC. It very well could be stuck.
You maybe able to try and get it to get unstuck by running the cars AC and switching from heat to AC back and forth and see if it gets unstuck. Just turn it on full blast and go from heat to cool.
If that fails, then you may need to service it. There should be a Lever Marked VENT under the dash, usually by the Brake
and other pedals on the Driver's Side. Close the VENT and that will
stop the Air from coming in and leave the A/C Blowing through the
outlets(Vents).
I also read this online if you have an electronic climate control. "On
climate control press off and heat button and let go quickly. Then
press automatic. The display will start rotating eventually displaying a
code 025,125 , 024 etc. Then press defrost to stop. You may hear blend
door operating atb that time. It worked for my climate control."
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