I checked the Archives first to see if this was one of those Vanagon idiosyncrasies such as leaky heads, etc.

I drained the reservoir and filled it up with conditioner/sealer but did not clean it out or flush the system as one member suggested.  Of course, the noise gets louder as I move the  steering wheel from left to right, but I guess that's because it's purging the system of air.  I take it that this is not a Vanagon quirk.

Thanks,

Walter Evens
Hesperia, CA, USA
2-85GLs