How I got rid of the Power Steering Whine

Discussion in 'Fox 5.0 Mustang Tech' started by jtfairlane, May 18, 2007.

  1. My power steering pump has been progressively making more noise little by little. It has always whined (since I bought it), but it starting getting noticeably worse recently. I decided to replace the pump, and am happy to say the end result has pretty much totally eliminated any whine from the power steering.

    A lot of people know this stuff, but this questions gets asked alot so I thought I would share with others what worked for me. I'd also like to thank Jrichker for help in recommending the easiest way to remove the old hoses that thread into the rack.

    I bought a rebuilt pump from Carquest. The directions that came with the pump stated that if the hoses (from the rack to the pump, from the rack to the cooler, and from the pump to the cooler) were more than 2 years old, that they should be replaced at the same time as the pump so as to prevent any internal rotting in the hose to clog the new pump.

    I bought 2 new power steering hoses (the ones that thread into the rack) from Napa Auto Parts. The one that goes from the pump to the rack is not shaped identically as OEM, and the instructions mentioned this, but it was redesigned and still fit fine. The only difference is that the retaining clamp (that holds the hose away from the serpentine belt) needed to be retained to the body in a different location than stock (which is below the battery tray).

    The low pressure hose that goes from the bottom of the pump to the cooler has no threaded fittings on it, so I cut a new section of 3/8" transmission cooler hose to the correct length and replaced it as well.

    With the new pump installed, I pulled off the low pressure return hose and capped off the nipple on the bottom of the pump. I then stuck the open end of the return hose into an oil catch pan. Pulling the coil wire off of the coil, I cranked the motor to flush the old fluid out of the system and into the pan. I made sure the whole time that the fluid level in the pump (as it decreased by being pumped through the system) was being topped off repeatedly so the pump wouldn't run dry.

    Once the proper fluid (Type F Transmission Fluid) was coming out of the open hose into the oil catch pan and had obviously replaced all of the old fluid, I then drained the fresh fluid out of the pump into the pan so I could reattach the low pressure return hose. I also made sure to add a power steering fluid filter to the return hose [​IMG] to ensure that nothing would get into my new pump, and then clamped the return hose to the nipple on the pump.

    I added fluid to the pump again, and raised the wheels off the ground. With the coil wire still off, I cranked the motor while turning the steering wheel back and forth to bleed the system of air. After I did that, I reconnected the coil wire and started the motor. With the engine running (and the wheels still off the ground), I continued to turn the steering wheel back and forth to bleed more air out of the system. I periodically checked the fluid level during this process to make sure the pump never ran out or got too low.

    After I was finished, I ensured the fluid level was correct, that there were no leaks, and I was done! I am happy to say, that there is NO power steering whine.

    So, to sum up:

    1.Reman. Pump
    2.All new hoses
    3.Power Steering Fluid Filter
    4. Fluid flush and replaced with only Type F fluid
    5.Bleed the system of air
    = SUCCESS!
  2. Great write up, what do you say the estimated labor time and cost come out to?
  3. The power steering fluid filter was a neat addition. I have never seen one used on a Mustang. Good idea! :)
  4. Well, I did most of the work. I couldn't find the proper power steering pulley puller locally so I paid a shop to remove the pulley from the old pump and swap it to the new pump/bracket.

    For me:

    Pump: $100 ($75 after core refund)
    Couple quarts of Type F ATF ($5)
    New hoses ($40-$50)
    P.Steering Filter ($2)

    Labor for pulley swap: $20

    I also got some additional tools for the job (crows feet, etc) that I wouldn't add into the cost for those people who already had that stuff.
  5. Yeah! What's neat was the 3/8" return hose goes straight down from the nipple for a few inches, and the filter needs to be in a straight section of hose (not bent), so it slides right in the hose right in front of the nipple and since the hose is straight for a while before it makes a bend to the cooler, the filter stays straight no problem =)
  6. Which 5.0s came with a power steering cooler and which ones didn't? I don't have a cooler, but mine is a 2.3 conversion and wonder if I *should* have one.
  7. Great write-up and step by step "How-to". :nice:

    I've added your thread to the Technical Index. :)
  8. I'd like to get rid of the groaning/whining sound of my P/S pump, too ... so I'm just going to switch to a manual rack. :D

    I've always wondered if those power steering filters ever worked. Always saw them in the back room at Autozone when I worked there, but nobody ever bought one, and I always had a feeling the thing would somehow get clogged up and just block your flow... :shrug:
  9. Great post, followed it to the letter and it fixed my power steering whine! started to get embaressing when showing up at the local cruise spot on saturday night!
  10. any reason as to why Type F tranny fluid is used and not power steering fluid????
  11. Type F is what the Service Manual and the Owners Manual Call for.
  12. I have manual steering on my Mustang, but my Explorer needs a new power steering pump pretty bad.. It whines and also leaks out the front seal. Ill try this write up on it since it uses the same pump :)
    Ryan Hardy likes this.