I noticed a bit of noise when turning the wheel in my 98 ZX2 and figured it needed a top-off of power steering fluid. It did...because the cap to my power steering fluid reservoir was gone! I added the fluid and then improvised by sticking the cap to the fluid bottle into the top of the reservoir. It was a perfect fit, but when I went to park after driving all over town, my power steering went out. Can someone tell me if I made a major mistake "improvising" on the cap? Is it not a sealed system? Or is it just that my fluid might have gotten really dirty by not having a cap for a while? I really am trying not to have to replace the whole thing!