I never noticed anything different with my steering until it got cold outside. I usually notice steering stiffness if I just get in the car and go without letting it warm up. I say stiffness, maybe it is locking up. Usually when it happens I just let go of the steering wheel for a few seconds and try again. I've got to get my oil changed soon, so I'll check on my steering and this rattle that's come back when I go in.