Hydraulic Fan questions

Lincoln LS

  1. 00LincLS

    00LincLS Active LVC Member

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    The Fan was working properly and now it doesn’t spin. I know the fan should be good and the only few things that could cause it not to spin is the fan motor, pump or actuator solenoid.

    1. Is there a way to test these parts to see which one is the malfunctioning part?

    2. If the fan is fine and it’s the motor, can I remove the motor off of the fan and replace it with a new one?

    3. Should I just replace all 3 components?

    Don’t suggest converting to electric please, working with what I have atm and converting is out of my range. Any positive help and feedback is greatly appreciated.
     
  2. joegr

    joegr Dedicated LVC Member

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    1. Yes, but most of the dealers even wouldn't invest in the test equipment.
    2. Yes.
    3. That's up to you. That was the usual dealer approach to the problem.

    You left fluid out of the list of possibilities above. How's the fluid?
     
  3. 00LincLS

    00LincLS Active LVC Member

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    The fluid is good and full.
     
  4. FDR

    FDR Dedicated LVC Member

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    It's not the actuator. Even when fully closed, the fan should still spin slowly
     
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    • 00LincLS

      00LincLS Active LVC Member

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      So what are you thinking it is? The motor? The pump? Or something else?
       
    • 00LincLS

      00LincLS Active LVC Member

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      Anybody have any ideas then? Since it was mentioned that it’s not the actuator. Does that narrow it down to the motor or pump or is there something I’m missing?
       
    • milehighmikey

      milehighmikey Dedicated LVC Member

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      If the fan is able to be turned by hand, the fluid looks decent, then I would still go with an actuator.
       
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      • 00LincLS

        00LincLS Active LVC Member

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        That’s what I’m confused about. The fan can be pushed by hand, the fluid is full. The comment from FDR is what’s confusing since they are saying it’s not the actuator. I don’t know what signs to look for to eliminate a part and need help.
         
      • joegr

        joegr Dedicated LVC Member

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        Do you see circulation in the reservoir when the engine is running?
         
      • 00LincLS

        00LincLS Active LVC Member

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        Do you mean like bubbling or the fluid level going down?
         
      • milehighmikey

        milehighmikey Dedicated LVC Member

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        You should be able to see fluid moving when you open the cap and look inside the reservoir.
         
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        • 00LincLS

          00LincLS Active LVC Member

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          I’ll check the fluid movement in about an hour and give an update
           
        • 00LincLS

          00LincLS Active LVC Member

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          I see the fluid moving or trying to move side to side
           
        • joegr

          joegr Dedicated LVC Member

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          So, the pump is pumping at least some fluid, but the fan motor isn't moving...
           
        • 00LincLS

          00LincLS Active LVC Member

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          So that should narrow it down to the motor since there’s fluid in it, there’s some type of fluid motion and the fan can be pushed by hand, correct?
           
        • joegr

          joegr Dedicated LVC Member

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          Unfortunately, I'm not 100% sure of that. If there had been no circulation, I think that it would pretty certainly be the pump.
           
        • 00LincLS

          00LincLS Active LVC Member

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          So it sounds like it’s either the motor or pump but to be certain I’d probably replace both the motor and pump.

          The other problem I’m having is find the oem number for just the motor and pump.
           
        • joegr

          joegr Dedicated LVC Member

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          The pump is (well was) YW4Z-8C628-BA.
          I can't find the fan motor.
           
        • 00LincLS

          00LincLS Active LVC Member

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          Yeah I’m not finding the motor alone. Everything I’ve found is the motor and the fan together. May just get the fan/motor together and the pump and replace everything.
           
        • jmeecer

          jmeecer Active LVC Member

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        • milehighmikey

          milehighmikey Dedicated LVC Member

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          lol just replace the solenoid! Trust me, you do not want to remove that fan motor just to find out that it was still good. There are fittings that are a complete bear to remove without fabricating yourself a new tool. In my case, I believe that i had to make a 4 inch 17 mm open end wrench out of a longer wrench. If I recall correctly, it also has to be thin to fit.

          At the same time, it wouldn't be too far fetched to tally up the costs involved in this endeavor and seriously think about an electric fan conversion. Dollar wise, it could turn out to be 1/4 of what it costs to replace everything that you are looking at replacing. At the end of the day, if you completely restore the stock hydraulic cooling fan system, you still end up with a quirky setup. No matter how much you polish that turd, it's still a turd. And yes, my turd is still working, on its 3rd solenoid/actuator. I only removed my cooling fan 9 years ago because I was changing the radiator. At that time, I was on my original actuator and no, the radiator did not fix it. It was a bad actuator.
           
        • 00LincLS

          00LincLS Active LVC Member

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          So what’s all needed to convert to an electric fan? Like parts etc.

          The actuator was actually one of the parts that I considered could be the problem. I then got confused by an earlier response saying it’s not the actuator.
           
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          • milehighmikey

            milehighmikey Dedicated LVC Member

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            There are some excellent posts regarding the topic. I do not have the details, but they involve what to get for a fan, where to get the power from to run it, and how to install another vehicle's thermal controller switch to provide the fan with intelligently switched power. It also tells you what to get for a new belt without the length needed to wrap around the pump delete, IIRC.
             
          • 00LincLS

            00LincLS Active LVC Member

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            Are they stickies in the forum here?
             
          • 04_Sport_LS

            04_Sport_LS Dedicated LVC Member

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