Question about Mercury Sable

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2002 Mercury Sable 6 Cyl. 3.0 - Another question about the power steering pump. When I start up the car, the power steering fluid drains down and when I turn the car off the power steering fluid comes back to its prior level. The rack was leaking so I replaced the rack so that was part of the earlier problem I had with fluid leaking out the top of the pump. My question is now: I'd like to know how to check the power steering pump itself and also I looked for a filter in the return line and could not find one. Is there supposed to be one on this model and if yes, how do I find it? Is the silencer the black thing that looks like a partially filled long balloon (the kind people make balloon animals with)? The previous answer to my question on the power steering pump referenced this silencer. How do I check it and what am I checking it for? Ron

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  • Ron Fredey Aug 06, 2010

    The response tells me how to test the pump but doesn't give me any info about the silencer or an in line filter. Any additional info is greatly appreciated.



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You will need to bleed the system. With the vehicle running, turn the wheel fully left then fully right several times. When the fluid level is low, turn off the car, add fluid and repeat the process until it no longer drops fluid level

Posted on Aug 06, 2010

  • Ron Fredey Aug 06, 2010

    I'm getting back pressure so when I turn the car off the fluid comes back to its pre-drop level. Just refilling it when it's low causes it to overflow. I'm trying to figure out how to get it so that it does not backflow once the car is shut off. Any ideas on that? Any idea about the silencer (muffler) and how that works with the system?

  • Nate Stansfield
    Nate Stansfield Aug 06, 2010

    The little cylinder is the silencer and also helps keep the pressure up. There is no way to test or maintain these. If you bleed the system and there is no pressure or the pump makes a groaning noise and the fluid reservoir is full, then the silencer should be replaced.

    If you have not bled the system, this is the procedure:

    1. Check the fluid level and add fluid, if necessary.

    2. Enable the ignition system. Start the engine and allow it to run for several minutes.

    3. Rotate the steering wheel from lock-to-lock.

    4. Stop the engine and check the fluid level. Add fluid, if necessary.

    5. If air is still present in the system, purge the system of air
      using Power Steering Air Evacuator 021–00014 or equivalent, as follows:

      • Make sure the power steering pump reservoir is full to the
        COLD FULL mark on the dipstick or to just above the minimum indication
        on the reservoir.

      • Tightly insert the rubber stopper of the air evacuator assembly into the pump reservoir fill neck.

      • Apply 20 inch Hg maximum vacuum on the pump reservoir for a
        minimum of 3 minutes with the engine idling. As air purges from the
        system, vacuum will fall off. Maintain adequate vacuum with the vacuum

      • Release the vacuum and remove the vacuum source. Fill the
        reservoir to the COLD FULL mark or to just above the minimum indication
        on the reservoir. Install the evacuator tool again.

      • With the engine idling, apply 20 inch Hg vacuum to the pump
        reservoir. Slowly cycle the steering wheel from lock-to-lock every 30
        seconds for approximately 5 minutes. Do not hold the steering wheel on
        the stops while cycling. Maintain adequate vacuum with the vacuum source
        as the air purges.

      • Release the vacuum and remove the vacuum source. Add fluid, if necessary.

      • Start the engine and cycle the steering wheel. Check for oil
        leaks at all connections. In severe cases of aeration, it may be
        necessary to repeat the procedure.


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How to check power steering pump on mercury sable 3.0:---

  • Check the power steering fluid levels. Make sure that the fluid levels are filled to the "max," or top line on your power steering reservoir. If your fluid level is low, fill it.
  • Loosen the hose clamp (if applicable on your vehicle) on the power steering pump hose and connect it to the pressure gauge on the steering system pressure tester.
  • Place the catch pan underneath the power steering pump.
  • Open the shutoff/bleeder valve on the power steering pump prior to testing the pressure with a box-end wrench.
  • Turn the vehicle on and turn the steering wheel from side to side. Make sure you are turning the wheel from "lock to lock"--in other words, all the way to the left until you can't turn the steering wheel anymore and then all the way to the right until you can't turn it anymore. This will bleed the power steering system, purging any trapped air inside the pump, and give you a more accurate measurement of the pressure the pump is putting out.
  • Tighten the shutoff/bleeder valve after one round of "lock to lock" turning of the steering wheel.
  • Close the shutoff valve to check system pressure for about 5 seconds. If the shutoff valve is closed longer than 5 seconds, your power steering pump can overheat and this can cause damage to the pump itself. Also check the power steering pump fluid level,if its low it can be the problem:-- Find the hood release, usually located beneath the dash. Pull.Walk around the front of the car. Find the hood latch. The hood latch is usually located at the front edge of the hood. Depress the latch. While depressing the latch, lift and open the hood.Locate the belts. The power steering pump is driven by a pulley and a belt and has a clear plastic or metal (usually round) reservoir on top if it. The power steering cap will often say "power steering." Check the fluid level either by looking at the side of the reservoir (if you have the clear plastic type) or by unscrewing the cap (for the metal type). Some reservoirs may have a small dipstick attached to the cap. Typically, you have a choice between checking the fluid warm or cold, and there will be corresponding "Hot" and "Cold" levels.
    Check out.keep updated.Thanks.

    Posted on Aug 06, 2010


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