Well - could be the PS gearbox, could be the hoses, could even be the break bomb. I have the same problems with my '89 635csi. Switch to Redline synthetic ATF, check all hoses (replace if necessary) and your problem should go away. There could also be air in the system that may need to be bled out of it, but I don't know how to do that. Hope this helps.
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Originally Posted by Deadrodent
hey everyone, i'm trying to fix my dad's car while he's away on vacation. his 635 is making a horrible power steering whine/groan and is leaking PS fluid underneath the car. I bought a few quarts of Dexron III ATF fluid to replace the fluid but I can't seem to find the PS reservoir. It doesn't help that there isn't much information about these cars on the web so I'm pretty much limited to you guys! hope you guys can help! thanks in advance!
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