detroit series 60 fan stays on

Discussion in 'Freightliner Forum' started by 97 FLD, Nov 5, 2011.

  1. 97 FLD

    97 FLD Bobtail Member

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    Nov 5, 2011
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    I have a 97 FLD 120 with a series 60 engine. As soon as I start the truck the fan comes on and stays on, cant seem to figure out what might be causing it. just replaced the bearing in the fan clutch. i check for an air leak. please help....
     
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  3. Sparkz

    Sparkz Light Load Member

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    Jul 10, 2011
    New Zealand
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    Check to make sure that any fan override switches are turned off.
    Do you have any active engine fault codes?
    Is the engine idling at its normal hot idle speed(600rpm), or is it idling fast?
    Check that the ac high pressure switch is correctly plugged in.

    Horton fan requires air pressure to release.
    Build the air pressure up and undo the air line to the fan clutch with the key on.
    If air rushes out the fan is mechanically locked and needs fixing.
    If no air rushes out, undo the air supply line to the fan solenoid. Heaps of air should rush out, indicating supply air is correct.

    Unplug the wires to the air solenoid. One wire should have 12volts ignition power. The other wire grounds out through the engine ECM.
     
  4. 97 FLD

    97 FLD Bobtail Member

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    Nov 5, 2011
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    Thanks so much for you help....

    I checked to make sure the fan override switch is off.
    no fault codes, engine idles at normal hot idle.
    checked and replaced the a/c high pressure switch.


    I believe the thermostatic sensor has gone bad and will try to located that tomorrow.
     
  5. 97 FLD

    97 FLD Bobtail Member

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    Nov 5, 2011
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    Fan Still running can not figure it out..... Please help
     
  6. Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    check auxially fan inputs with DDDL.....
     
  7. stranger

    stranger Road Train Member

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    NC
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    The fan solenoid will go bad, causing your problem. I had to replace two within a year once.
     
  8. 97 FLD

    97 FLD Bobtail Member

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    Nov 5, 2011
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    replaced it already... thanks...
     
  9. 97 FLD

    97 FLD Bobtail Member

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    Nov 5, 2011
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    what is DDDL??????
    and how do i do that??
     
  10. stranger

    stranger Road Train Member

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    Check the circuit breaker, or fuse, whichever it has. Default with a bad fuse is fan on.
     
  11. 97 FLD

    97 FLD Bobtail Member

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    Nov 5, 2011
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    Please advise if this is the correct location.
    I checked the circuit breaker and fuse, relay, (is it located inside the kick panel in the center by the gear shaft?) Checked it everything looks good.
     
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