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Thread: Air in power steering line, How to flush/bleed it? Reply to Thread
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Topic Review (Newest First)
10-08-2012 09:16 PM
amc49 The pump has no way of knowing whether half or overfull. As long as level never gets low enough to suck more air you should be fine. The pump will get noticeably louder when it eats air.

Lots of people have trouble and whatever trick they are working at the time is the supposed cure. The point is that air can really get chucked in there and the ONLY WAY it will EVER bleed is for all fluid to get back up into pump to be able to release its' air since air is trapped everywhere else in the system and cannot get out.

If you have more than enough fluid to fill it open and ready to go you can get someone to start car, run rack one way and then other, and you filling pump as fast as it eats. Done correctly it fills instantly with no air at all and no bleeding to be done. I do it all the time but you have to be quick about it.

I have jacked car up but actually better not to since car weight makes the torsion valve in rack open more to bleed more completely and faster. No load on that valve with car in the air..............
10-08-2012 10:01 AM
frednumber15 I installed a rebuilt rack....and was following the Ford FSM method for refilling (other than using vacuum).

Didn't work.

What does work? Fill the res up to within 1/2" of the top and turn lock to lock...let it sit a at full lock (but not to the point that the pump is working hard)..let it sit.

If you never have the level above the FULL will just pump foam. As soon as I filled the cleared up in under a minute. You can ALWAYS remove a little level ended up right at the full mark.

Then...lo and behold...the next morning the level was within 1/2" of the I took some out...down to the top mark. Then I started it ...turned wheel from lock to lock 2 times or so....shut it off. Level was now down to the bottom of the res. So I added some back to the full mark. Has now stayed there for 30 miles or so.

Recommendation? Fill it up to about 1/2" below the cap and keep it there till you are sure it has stabilized. If it overflows and runs out...who cares...if it stays off the serp belt? Once you've driven it for a while and all seems well...put the level at the top mark.
10-08-2012 04:57 AM
whynotthinkwhynot Wow.. roll back the clock to answer a thread. I wonder if the guy ever finished.
10-08-2012 04:21 AM
amc49 You can damage parts by leaving the steering at full lock left or right for a long period.

It's GOING TO recirculate foam, motion tends to trap air. The only way to stop it is stop engine and let foam come out in reservoir, you have to repeat since foam in the rack cannot get out until it's in the reservoir also.

Done correctly you can install fluid with almost no aeration at all. The system is almost instantly self bleeding, the trick is to get the new fluid in there quick enough so that the pump can never run out and pull air. Once pump starts whining say when you are uncapping the second bottle of fluid to put in you have already screwed up.
10-06-2012 04:25 PM
frednumber15 You need to watch the level in the res as you run it and turn the wheel...mine only stopped foaming after I filled the res almost to the top and turned it back and forth...also let it sit idling turned all the way left and right. It was picking up and recirculating foam.
03-20-2012 02:11 AM
amc49 A tip. Sometimes the air is fixed finely with the fluid itself, especially if you let it run empty for a bit. Purge the lines left/right to lock as said then let car sit 10-15 minutes for fluid in reservoir to de-aerate. You may have to do it a couple of times. Later on the noise miraculously has disappeared.
03-10-2012 11:09 AM
sailor While jacking isn't REQUIRED, it makes life easier & reduces wear on the tires etc..

Since you have to turn the steering back & forth quite a few times to get most of the air out....

I just had to do this TWICE on a Chevy Monte Carlo with a damaged cooler line, once for the initial "emergency" repair & again when I replaced the damaged cooler assembly for a friend... It wasn't COMPLETELY bled till after a good test drive as well.... THAT got the last bubbles out of the system, though it was close to OK before I drove it..

Patience & a LOT more wheel twisting than you expected to need to do is the key, when it doesn't work right away it'll worry you a bit - just give it more time to circulate. The system doesn't work well at all on air, and it takes a while to get it all out...

03-10-2012 10:00 AM
daidie just turn the wheel full lock one way to full lock the other a few times. just keep an eye on the pas fluid in the reservoir. no jacking required.
03-09-2012 03:21 PM
fordcrazi i tryied this and it still wont make my power steering stop whining
08-02-2007 12:54 AM
Originally Posted by DougoeFre5h View Post
Update, did what you said and it worked. Damn that was easy, I was getting ready to start unbolting shit. Thanks!
I bet the guy in your avatar doesn't even need a wrench!
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