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it's not likely the hydraulic motor itself since it just responds to the pressure it is fed and turns. I think it's pretty reliable.
Check the coolant temp sensor and its wiring harness for this which is mounted on the water inlet housing down near the thermostat on this engine. (A bitch to get to)
As well, you may want to locate the solenoid near the power steering pump and disconnect it temporarily to see if it stops the fan. If it doesn't, it's probably stuck open. If it does, then you will need to trace back to the Fan ECU and its inputs to see what is going on.
The best manual for you is the 1993 Lexus ES300 which describes the hydraulic fan stuff in intricate detail. See the 'Engine.pdf', specifically the '62coolantc.pdf' subsection starting on pg. 265.
cheers,
dave mc
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