My power steering makes an intermittant whining noise when applied, more so when the car is hotter. I was down the ring a few months and when I finished my first lap I realised I had lost my PAS, obviously I didn't realise whilst doing the lap due to the speed but when I finished and realised it took the car 30mins of cool down to start working normal again. After that it was fine. A vehicle mechanic I work with thinks that the fluid might need changing as It probably boiled due to the car heat and became ineffective. Would this explain it? Has anyone suffered this before and should I just get the fluid changed? I was looking at getting a 2nd hand pump, new belt and change the fluid completely just to have peace of mind so it doesn't happen again. Any Advice? Sorry title is wrong, should be E46!