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Re: I think is the power steering pump...
Camshaft sychronizer and the idler pulley are possible "other" sources of noise.
My idler pulley had me chasing my tail....replaced the power steering pump.....found that the noise was caused by the idler pulley the whole time.....but it would not make noise below a certain RPM.....seemed fine when spun by hand with the belt off.
For fluid, use Mercon V ATF fluid in your 99 windstar.
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