Recently I’ve noticed my Heater(auto climate) fan oscillating from high to low. Has anyone else had this issue?

Yea, on the auto setting mine does this as well. I'm assuming it's part of the auto controls, I've also noticed it will cycle from floor vent to dash vent. I'm pretty sure it's supposed to do this, trying to keep the cab at the temp you selected.

my blower stayed on even when the truck was turned off had to pull the fuse to keep the batteries from going dead, took it to the dealer and they changed the control module, picked it up the next day and the dealer said he got 3 more in today with the same problem, it didn't oscillate just blew on hi, don't know if it was do to the cold it was -20 outside just a heads up only 4500 miles on the truck

My truck just started doing this, 7200 miles. I think it was associated with the cold, because it only does it when it is really cold out. It is quite annoying and even if I override the auto controls and put it on high manually it oscillates/surges. I have yet to find a dealer that I feel comfortable with to look at the truck. I think it is a module issue though and needs to be replaced under warranty. I think my 02 had this issue as well.
My .02.

Anyone else??