Do you have the automatic climate control or the manual?
If yours is automatic, the drivers side actuator only controls the air mix (hot/cold) on that side. There is a second air mix servo on the passenger side. If by "All my vents" you mean just the drivers side while the passenger side works normally, then it's probably the actuator. If both the drivers and passengers sides are blowing only hot air, and both will switch vent modes normally, it could be that both actuators failed at the same time, but that is unlikely and there is probably another reason, such as leaked refrigerant or your AC pump failed which is common on this platform.
With regard to replacement without removing the instrument cluster, yes it is possible but you will probably at least have to unscrew it and rotate it out of the way so that your arm can pass through the opening, as the cubby hole opening is probably too tight to get in there and also successfully unscrew the top bracket screw on the actuator.