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VED 12 05 electric visco fan first gear wont kick in

Discussion in 'Trucks [ Eighteen Wheelers ]' started by chiljig, May 23, 2015.

Page 2 of 3
  1. May 25, 2015 #11
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    to fit override fan switch u have to add female terminal to VECU and install switch in cab in place u want)))) And put sticker on it))))
     
    Pablo-UA, May 25, 2015
    Pablo-UA, May 25, 2015
    #11
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  3. May 25, 2015 #12
    chiljig

    chiljig Bobtail Member

    40
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    May 5, 2013
    0
    my truck overheat due to no first fan speed not engaging. VECU has a lot of wires not sure which one to add terminal to . I know old air fan but this PWM completely cut me of guard because dont have any idea how to bypass it. here is my fan connector voltage reading. i know two grounds and one 12v and one 5v. but ive got two 5v on it. here is how it looks
     

    Attached Files:

    chiljig, May 25, 2015
    chiljig, May 25, 2015
    #12
  4. May 25, 2015 #13
    benrab

    benrab Medium Load Member

    326
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    Apr 5, 2015
    Quebec ,Canada
    0
    That kind of viscus fan clutch is progressive fan clutch and not easy to troubleshoot, like Pablo said it's control by the Engine ECU,base on truck that i have seen and road tested with the same fan clutch part number of your truck.
    When the engine is cold and you start and drive on the road you heard the fan making noise like full engage for the first 2-3 minutes then the fan comes quiet (Normal operation).
    Suggestion:
    With the engine is cold and the engine stop turn the fan blade with your hand (clockwise view from front) when everything is normal it's hard to turn the fan blade fast with your hand, but easy to turn slow.
    If you can spin it and continue to turn by itself ??
    It's not a very popular fan clutch on trucks in my area, up to now when problem occur we have to replace the clutch.
    I did a search and the fan blade and the fan clutch itself can be purchase separatly.
    Hope this can help.
    Ben
     
    benrab, May 25, 2015
    benrab, May 25, 2015
    #13
  5. May 25, 2015 #14
    chiljig

    chiljig Bobtail Member

    40
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    May 5, 2013
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    as i said fan clutch was already replaced and everythink works fine when truck is not moving im mean in netrual soonest i shift to 3th gear its dosnt work any more. i know it makes no sense but thats how it is,
     
    chiljig, May 25, 2015
    chiljig, May 25, 2015
    #14
  7. May 25, 2015 #15
    benrab

    benrab Medium Load Member

    326
    238
    Apr 5, 2015
    Quebec ,Canada
    0
    Sorry, i didn't see the fan clutch has been replace yet. . . .
    Did your engine ecm has been change or recalibrate recently for any reason ?
    The fan clutch management is a sub-system of your ECM calibration, there two possibility ON-OFF air fan or Viscus Fan in the ECM menu ?
    Is it possible that your ECM didn't match your truck S/N ?
    Just an idea ?
    Ben
     
    benrab, May 25, 2015
    benrab, May 25, 2015
    #15
  8. May 25, 2015 #16
    chiljig

    chiljig Bobtail Member

    40
    2
    May 5, 2013
    0
    well let me start:
    1. second fan gear doesn't work. so mechanic replace the fan clutch.NOTHING Changed
    2. ECU was replaced and that fixed the problem , but after few weeks had to replace the harness do fixsome other trans issue and than the problem started
     
    chiljig, May 25, 2015
    chiljig, May 25, 2015
    #16
  9. May 26, 2015 #17
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,642
    Oct 11, 2010
    Borispol, Ukraine
    0
    Any fault codes?

    Can you post engine protection log from engine ECM?

    How hot is engine? Overheating is over 103 dgr c (218 dgr F)
     
    Pablo-UA, May 26, 2015
    Pablo-UA, May 26, 2015
    #17
  10. May 28, 2015 #18
    chiljig

    chiljig Bobtail Member

    40
    2
    May 5, 2013
    0
    im not sure what protective log is but no fault codes but here what ive found
    well i was all wrong. samehow ive connected fan to work on highspees all the time . and it overheats . soonest i heet some hills it will easy hit 218 or more on fan clutch second speed engage from the start if i dont pull over it will shut off due to overheating .
    i guess have to replace radiator which was put in last year. if i hook at volvo ptt can i check if something else is mested up before replacing radiator ?
     
    chiljig, May 28, 2015
    chiljig, May 28, 2015
    #18
  11. May 28, 2015 #19
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,642
    Oct 11, 2010
    Borispol, Ukraine
    0
    No second speed. IT IS PWM CONTROLLED

    It changes speed w/o steps
     
    Pablo-UA, May 28, 2015
    Pablo-UA, May 28, 2015
    #19
    beltrans Thanks this.
  12. May 28, 2015 #20
    chiljig

    chiljig Bobtail Member

    40
    2
    May 5, 2013
    0
    well high speed than :)
     
    chiljig, May 28, 2015
    chiljig, May 28, 2015
    #20
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