no heater control

98 grand prix 3.8 gt with digital climate control. what is the part called that switches the heater modes? Like defrost,floor, or vents. I have heat but it just wont switch modes. Is it called the heater control switch or mode actuator motor? Cant remember.

have you check for vacuum leaks? I think the vacuum line that runs near the battery is the one that contolls HVAC position. Might want to check and see if its broken.

heater blend actuator is what it's called i guess.