I have a '90 4runner v6 4x4, auto. I have just replaced the power steering pump, and I have a god awfull whine comming from the pump. Not only when I steer but when the brakes are aplied too. whats causing this? Its like I have the wrong fluid in or something. I'm using the factory recomended Dexron III. When I 1st installed the pump it was doing it so I got a exchange for another and still the same thing happens. Anybody have any sudgestion. Its driving me crazy. Thanks

 

Did you get all the air out of the system. It takes a while. In the manual there is a method to getting the air out of the system, and making sure you have enough fluid. The only time my PS pump whined is when I didn't have enough fluid. Even now with 37" tires, I don't hear any complaining from the PS pump.

 

I use the bleeding instructions here:
- http://howeperformance.com/bleedinginst.html

And likely you have ABS brakes and the ABS actuator is powered off of the power steering pump via lines off of the steering box.

 

OK I'll try that, I thought I bleed the system good with the tires off the ground but I didnt do it this way. It looks like I didnt have the right fluid either, so I'll flush that out to. Thanks guys

 

For an all-Toyota system, ATF is the proper fluid.

 

I'm have valovoline dexron III in right now and Ill try to bleed it out again tommorow. I'll post up my results.

 

Well I went threw the bleeding process again and the fluid looks perfect and no whining. YAY!!! But its at operating tempeture. We see tommorow when its cold how it does. Thanks guys!!!