Hey guys..new here. I found this forum while researching the fan speed issue. My WK2 Limited V6 has a build date of 12/10.
I took the car to the dealer yesterday for the issue, and the tech had no idea what was going on. He agreed that there's an issue but also stated Chrysler has no fix for it at this time. He said to keep checking back.
I first noticed my issue when putting the car into gear from Park or Neutral. The fan speed either slows or the diverter/blend doors send the air to another location...I can't tell yet.
I too notice erratic fan speed when accelerating/decelerating. It's REALLY annoying me.
Glad I found this thread though...