HVAC or actually blend actuators
 

Hello

I have Cadillac ats 3.6 2013 base model and i have a problem that the ac sometimes gets hot and sometimes it's cold on the drivers side and hot on the other side and sometimes drivers hot and other is cold
I took the car to the dealership garage and they said I have to remove the dashboard to get this issue fixed and replacing the ac blend actuators and I wasnt sure the dashboard has to be removed

Can anybody help me fixing that issue
Does anyone know how to replace the ac blend actuators ? Is it the same thing with another name HVAC or its different part ?