HELP - 2001 Kia sportage 4x4 Power Steering problem

My power steering started going on and off 2 month ago
Las month it went all the way out
Otherwise Kia running perfectly - No check engine light

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fluid ok - not leaking fluid
power steering belt in good condition
already replaced power steering pump
already replaced gear box
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Anymore ideas?

Last edited by HpyUnBday; 09/14/07 12:29 AM.