Up or down and/or left or right.I don't like being blown at generally, and so this gets talked about at home, and so I understand you perfectly when you talk about changing the wind direction of the air-conditioner. I am usually more specific though and ask for the air-conditioning to be blowing up or down.
... or Can you adjust the vents? Why the person can't do this for themselves, I don't know.In my experience it is not unusual for an air conditioner to have vents that can be pointed in different directions. (I've never seen an air-conditioned car where this wasn't possible.) I would probably say "Can you point the air conditioner away from me?" There are many other ways to say this.
In my place the person could only adjust the vents for themselves (up/down or left/right) if I gave them the remote control and explained how to use it (quicker to do it myself...). They could do it by themselves in my car as the only vent they wouldn't be able to reach is the one to the left of me (or to the right of me if driving a right-hand drive car in the UK).... or Can you adjust the vents? Why the person can't do this for themselves, I don't know.
We talk of vents, not blades. And air, not wind. If you adjust the vents (up/down or left/right), the direction of the air changes.So we cannot change the direction of an AC but we can ask to adjust the vent. Am I correct? But the blades can be adjusted that guide the air towards you. I am confused what to say.
Can we say "Blades guide the air towards you"?