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Why won't my fan clutch clutch disengage?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by slick3653, Feb 22, 2014.

Page 1 of 3
  1. Feb 22, 2014 #1
    slick3653

    slick3653 Bobtail Member

    8
    0
    Feb 22, 2014
    Pinetown, North Carolina
    0
    I have a 1995 Mack CH613. My fan is running constantly. I have run electrical continuity tests, air tests, and replaced the fan clutch solenoid switch...fan still runs wide open. I removed the air line to the solenoid and replaced it several times and you can hear the fan clutch engage as soon as it gets air. Any ideas?
     
    slick3653, Feb 22, 2014
    slick3653, Feb 22, 2014
    #1
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  3. Feb 22, 2014 #2
    baha

    baha Road Train Member

    4,137
    2,835
    Jul 25, 2013
    ga
    0
    CK. if your air lines might be reversed, take them off change them?
     
    baha, Feb 22, 2014
    baha, Feb 22, 2014
    #2
    slick3653 Thanks this.
  4. Feb 22, 2014 #3
    pop's

    pop's Light Load Member

    54
    16
    Feb 3, 2013
    Yulee FL.
    0
    jump your a/c high press switch.
     
    pop's, Feb 22, 2014
    pop's, Feb 22, 2014
    #3
    slick3653 Thanks this.
  5. Feb 22, 2014 #4
    Jimmbuds

    Jimmbuds Medium Load Member

    398
    179
    Apr 20, 2009
    Daytona Beach, FL
    0
    Just FYI this happens to mine at random intervals. I have narrowed it down to when the engine is cold and moisture seems to find its way into something. What that something is I am not sure, I am assuming it is the clutch. It normally takes 350 to 800 miles to shut off. The last time it happened I got flustered and changed the fan switch and then the clutch. After replacing the clutch it there was no issues. Just something to take into consideration.
     
    Jimmbuds, Feb 22, 2014
    Jimmbuds, Feb 22, 2014
    #4
    slick3653 Thanks this.
  7. Feb 22, 2014 #5
    slick3653

    slick3653 Bobtail Member

    8
    0
    Feb 22, 2014
    Pinetown, North Carolina
    0
    Reversed the air lines with no change.
     
    slick3653, Feb 22, 2014
    slick3653, Feb 22, 2014
    #5
  8. Feb 22, 2014 #6
    slick3653

    slick3653 Bobtail Member

    8
    0
    Feb 22, 2014
    Pinetown, North Carolina
    0
    Dumb question, how do I do that?
     
    slick3653, Feb 22, 2014
    slick3653, Feb 22, 2014
    #6
  9. Feb 22, 2014 #7
    Jimmbuds

    Jimmbuds Medium Load Member

    398
    179
    Apr 20, 2009
    Daytona Beach, FL
    0
    Get you about a 5 inch piece of wire. Unplug the connector from the high pressure switch and put your wire in one side of the connector and the other end of the wire in the other side.
     
    Jimmbuds, Feb 22, 2014
    Jimmbuds, Feb 22, 2014
    #7
  10. Feb 22, 2014 #8
    bigdad7

    bigdad7 Road Train Member

    1,837
    1,364
    Jun 6, 2010
    ks
    0
    Make sure some didnt change the fan cletch someone did that on mine we kept putting the wrong soenoid on best way to check this get a universal solinoid and match it to the clutch
     
    bigdad7, Feb 22, 2014
    bigdad7, Feb 22, 2014
    #8
    slick3653 Thanks this.
  11. Feb 22, 2014 #9
    slick3653

    slick3653 Bobtail Member

    8
    0
    Feb 22, 2014
    Pinetown, North Carolina
    0
    Sorry,I meant, where do I find the high pressure switch?
     
    slick3653, Feb 22, 2014
    slick3653, Feb 22, 2014
    #9
  12. Feb 22, 2014 #10
    slick3653

    slick3653 Bobtail Member

    8
    0
    Feb 22, 2014
    Pinetown, North Carolina
    0
    Brain fart...I know what you're saying now. I will try that next. Thx.
     
    slick3653, Feb 22, 2014
    slick3653, Feb 22, 2014
    #10
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