Lincoln Navigator AC only cold on driver side – any ideas?

I've got a 2019 Navigator and the air conditioning has developed this weird split personality – driver side blows ice cold but passenger side is noticeably warmer, almost like the blend door actuator is stuck. I've been reading up on possible causes and some forums mention low refrigerant can cause uneven cooling, but wouldn't that affect both sides equally? Before I tear into the dashboard myself, I wanted to see if anyone in Sharjah has dealt with a similar issue on a Lincoln. You can View More about common AC problems on these models, but I'd rather hear from someone who's actually fixed one. Does this sound like an actuator problem or could it be a clogged evaporator core? I'm located near the Sharjah Airport area, so if anyone knows a garage that won't charge me a fortune just to diagnose, please let me know. Really don't want to drive across town with half the car sweating and the other half freezing.