Why does my car AC vents blow hot air when AC is switched off?

I bought a new car in the month of April 2019 but from the past few weeks, I have been experiencing very very hot air coming from all the vents.

The temperature is high to an extent wherein it becomes unbearable and I have to switch on AC (currently it’s pleasant outside in my city so AC was not required).

I recently measured the temperature and it was greater than 44 degrees Celcius/108 degrees Farahenite. And I am sure I experienced hotter than this.

So bit worried and wanted to seek an opinion from the experts. Sharing some data:

AC unit type: Automatic Climatic Control

Route: Office to Home

Distance: 6 KM

AC status: Off

Re-circulation mode: Off

Windows: Rolled down

Temperature: 43 degrees Celcius/108 degrees Fahrenheit