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3406 fan won't come on

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Rick Wilmath, Aug 27, 2016.

  1. Aug 27, 2016 #1
    Rick Wilmath

    Rick Wilmath Light Load Member

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    May 15, 2016
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    I have a 1993 Freightliner and a 3406 motor. The engine fan won't come
    on either automatically or manually.

    I checked the manual switch and it is getting juice to the switch
    and when I turn the switch on voltage is going out the other side.

    When I turn the manual switch on I heard an air noise at the engine
    and found it at the solenoid. There is a small hole in the solenoid
    and air is coming out.

    Does the solenoid send air to the fan hub?
    Is there a way to check to see if the air is getting to the fan hub.

    The fan itself freely spins. I don't hear any bearing noises.
    Thanks
     
    Rick Wilmath, Aug 27, 2016
    Rick Wilmath, Aug 27, 2016
    #1
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  3. Aug 27, 2016 #2
    AModelCat

    AModelCat Road Train Member

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    Most fans use air to hold the fan released and exhaust it to engage it.
     
    AModelCat, Aug 27, 2016
    AModelCat, Aug 27, 2016
    #2
    Rick Wilmath Thanks this.
  4. Aug 27, 2016 #3
    ibcalm19

    ibcalm19 Road Train Member

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    Disconnect the air line to the fan & see if air is getting to the fan
     
    ibcalm19, Aug 27, 2016
    ibcalm19, Aug 27, 2016
    #3
    Rick Wilmath Thanks this.
  5. Aug 27, 2016 #4
    Rick Wilmath

    Rick Wilmath Light Load Member

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    So if air is being exhausted out the solenoid does that automatically mean that the fan clutch isn't working?
    Thanks
     
    Rick Wilmath, Aug 27, 2016
    Rick Wilmath, Aug 27, 2016
    #4
  7. Aug 27, 2016 #5
    kwswan

    kwswan Road Train Member

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    No,it means the solenoid could be bad.
     
    kwswan, Aug 27, 2016
    kwswan, Aug 27, 2016
    #5
    Rick Wilmath Thanks this.
  8. Aug 27, 2016 #6
    062

    062 Road Train Member

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    Depends on which fab hub you have. Some lock up air on,others air off.
    Easiest way to find out,remove line from solnoid going to hub. Any air coming out? If not the safest way is jump 12v to solnoid,but you can start the motor just make sure nothing can get in fan. If still no air solnoid is bad.
     
    062, Aug 27, 2016
    062, Aug 27, 2016
    #6
    Rick Wilmath Thanks this.
  9. Aug 27, 2016 #7
    maggard359

    maggard359 Medium Load Member

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    You can also take the line loose going to fan and use blowgun to engage and disengage fan to rule the fan out leaving the solenoid. If you are on the road and need to get back home to fix you can lock the fan to the hub with two bolts I believe 5/16 maybe 3/8 I don't remember right off. you will have to locate holes and line up.
     
    maggard359, Aug 27, 2016
    maggard359, Aug 27, 2016
    #7
    Rick Wilmath Thanks this.
  10. Aug 29, 2016 #8
    Rick Wilmath

    Rick Wilmath Light Load Member

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    May 15, 2016
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    Thanks everybody for the help. I'll try the ideas and let you know.
     
    Rick Wilmath, Aug 29, 2016
    Rick Wilmath, Aug 29, 2016
    #8
  11. Aug 30, 2016 #9
    killer120

    killer120 Light Load Member

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    Jul 1, 2013
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    either got a bad solenoid or bad fan clutch if the wirings and switch is still good
     
    killer120, Aug 30, 2016
    killer120, Aug 30, 2016
    #9
    Rick Wilmath Thanks this.
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