Power steering

That is because the power steering fluid gets thick like a grease when it gets very cold. That fluid does not move very well until it heats up. Your car uses PSF-3 which is a conventional oil. The newer fluid they use is PSF-4 which is a synthetic. But in order to use the -4 in your car (which is actually a TSB to correct stiff cold weather steering) you need to drain/remove as much of the -3 as possible and then you can refill with the -4. Oh and you can usually buy the OEM PSF-4 cheaper at a Kia dealer.