i have an '06 mdx that makes an obnoxious whining sound from the power steering pump when i first start up. this only happens when its cold outside (anything below 50) it typically goes away once the car warms up. This makes me think its not a bad pump but something to do with viscosity of fluid perhaps?. is there a filter in the line could somehow restrict the flow if the fluid is a little thicker when cold??. I am reluctant to simply swap the pump as it seems as if there is a little more to it. any ideas??