Took trip to Walmart this morning to stock up, roughly 25 mile one way trip, and as I got closer I noticed something making noise, and when I got to the parking lot I could hear it was my power steering making much more noise than it should. After shopping for 30 minutes I came back out and the whole trip back home, no noise at all. So why would it be making noise then stop after it's sit for 30 minutes? Has around 83,000 on it. I checked fluid level 3-4 months ago and was fine.