Thanks for the reply. Excuse my ignorance but I’m not very knowledgeable on this stuff myself. What would I be looking for to figure out if the compressor is engaged [?]
With the hood up and the A/C on, you should be able to see the clutch engage and disengage on the compressor. When it's disengaged, the belt is turning the wheel on the compressor, but the center section of the wheel is not turning. When the A/C is turned on, the clutch should engage which causes the center section to turn with the wheel.
...and if the actuator is malfunctioning?
For this, you need to turn the engine off but key on. It helps to turn the radio off, too. If you move the hot/cold blend knob, if you listen very carefully, you should hear the actuator moving the blend door.
Another test for this is, with the engine running and up to temp, turn on the heater, feel the hot air coming out of the vent, then move the temp selector to cold, and see if the air temp changes. If it stays hot, the actuator is stuck/not working.
In summary, play with the A/C controls. See if you can get cold air blowing by moving the temp selector back and forth, and pushing the A/C button off and on. It could be something as simple as an intermittent relay somewhere that's causing the compressor to not come on. Sometimes, with repeated attempts, it will begin working again, for a while. Ultimately, once it's identified, it can be replaced.