Originally Posted by drivethruecp
YES! nailed it! I have this same problem and EVERY time I bring my car in for warranty I complain about it. It only happens randomly but as long as the fan switch is on a 1/2 or more (on at all) it goes right away immediately. Now if it were debris in the way wouldn't it increase in sound if the fan was turned on...
Originally Posted by drivethruecp
My last chance at the dealer is this week before I'm out of warranty. Anyone get this fixed or isolate the problem to 100% debris. If not whatever it is I'm going to get replaced this week if anyone can tell me what it is?
Thank you! Hopefully I get a response from someone who solved it in the next day or so 
Sounds like you and I have the EXACT same symptoms. blackcrossfire07 sent me the following.
"As for the AC light, I had that problem twice over the past 4 years. That is a simple fix and a common problem with the car. If you look around on the forum you will see. It was the whole AC unit switch both times. For whatever reason they keep breaking. I fixed that 2 years ago and just fixed it again a couple months ago. It is very annoying because the AC just comes on when it is in the off position. Sometimes when you have the vent open, the AC will come on and blow the fan speed at level 1. It was real whacky! But that is definitely the whole fan switch going bad. It is an 800 dollar part new I think... but you can pick up a used one on ebay or something for about 70. I am thinking it is good to keep a couple in storage for when the warranty runs out!"
So there's something else to suspect I guess. (remember that this info came from a BLACK XF owner. Take it for what it's worth!
) I still say there's a relay back there going crazy.