91 Syncro Camper, 155,000 miles

The power steering died away slowly over a period of 2 weeks of occasional
driving. Steering takes a bit of effort, but sometimes part way through
the turn it gets easier briefly. This is occurs particularly at slow
speeds and while parking. Barely noticable at speed.

The power steering pump has no leaks and does not make noise while the
pulley is turning, the drive belt is of appropriate tension, and there are
no leaks in the power steering lines. The fluid level is appropriate, and
has not changed.

Something that occured to me yesterday (and I cringed) is that maybe my
viscous coupling is seizing.

Suggestions?

Michael

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