Question about 1999 Ford Ranger SuperCab

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Power steering pump is whining, I replaced it and the new one whines just as loud. what could be wrong

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There is air in the power steering line. It needs to be bled. In order to do that take top off power steering reservoir and turn wheel from left to right until lock and on both sides meaning turn it l/r until you can't turn anymore.Don't hold it there just keep turning until the whine goes away. If you don't bleed system pum will go out again.

Posted on Feb 13, 2013

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Make sure your using power steering fluid recommended for the vehicle. If automatic transmission fluid it aerates causing bubbles. It's very similar to the effect of shaking a bottle of liquid detergent vigorously when half full. Having that much air in the system can cause it to whine very loudly and reduce the life of the pump.

Posted on Oct 14, 2010

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the power steering pump will also make a whining noise too.

turn the wheel all the way to the right and hold steady pressure against the stop. this puts maximum force on the power steering pump and, if the power steering pump is the one making the whine, it will change the sound of it. (usually louder).

if the trans pump is making the whine noise, it should sound different in neutral compared to drive. this test will really only work if it make the noise without the vehicle moving. if it wont do it at idle hold the rpms at 2000 or so.

if you decide the noise is coming from the transmission, and the transmission filter has not been replaced (assuming you installed a used transmission), replace the filter by removing the oil pan.



oh and also, if it is the power steering pump you should be able to make it make the whining noise while the vehicle is stationary. if it wont make noise unless its moving its not the power steering pump.

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Reminds me of a Ford where the bearings went bad in the pump. If the whine is definitely 100% coming from the pump, it's probably going bad. Try going to a junk yard that will let you pull a pump from a wrecked 'stang before buying a new pump to see if the problem goes away.

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