2007 power steering

2007 caravan sxt 3.3 sfi

I am getting a PS whine at startup at anything below about 60 degrees outside. it lasts about 3-4 minutes, even just at idle.
Everyone said to change or clean the screen in the PS resivoir. So i did that and it definitely isnt restricted, cleaned it real good and flushed about 2-3 quarts of the old fluid out and added new atf-4.
Problem still persists after that, not sure what to do. Is it possible the pump is shot, even though all noise goes away after 3-4 minutes?

Is the assist affected while it's noisy?

Exalted, possibly air in the system? Do you think an additive would help? Since it goes away rather quickly it is probably not a serious problem. I've heard more than a few do this of various makes and models.

plymouthsrock, no the assist doesnt seem to take a hit.
james, thats what i thought too but i did a bleed procedure a few times to no avail

2007 caravan sxt 3.3 sfiI am getting a PS whine at startup at anything below about 60 degrees outside. it lasts about 3-4 minutes, even just at idle.

My 2003 Grand Caravan was doing the same. Seems the previous owner put in some generic power steering fluid instead of the recommended ATF+4. So here's what I did...I got a turkey baster, sucked out as much PS fluid as possible from the reservoir and refilled with ATF+4. Now it's quiet as a mouse.

Cheers,

Joe

I've heard that sometimes you can't really get the screen clean.