help power steering c240
when i rev the engine (1.5-2.5 rpm) power steering is okay, but there's this annoying whine sound.
*minimal leak coz the fluid in the reserve goes down slowly..
what could be the problem? power steering pump? leaking hose? or rack and pinion?
my car is a 2002 c240 with 47,000 miles only.
Thank you



