I am sorry to hear the fan clutch did not solve the problem. However, I would continue down the same path by continuing to eliminate the potential cause of the noise. My next "Test" would be to drive the car without the power steering pump turning. Rig up the belt drive in a way that eliminates the PS pump. A shorter belt, or even no belt would be fine. You didn't mention if the car has AC. Ideally, you want the water pump, alternator and AC if equipped turning. Drive the car and see if the noise goes away. If no squealing noise, at least you know for sure it's in the PS system. Then we can go from there. Testing is the only way to solve these kinds of problems. BTW, with a fully charged battery you can drive the car for testing 10 minutes or so without the water pump or alternator turning. Just keep an eye on the temp gauge.
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