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Cummins m11 fan

Discussion in 'Trucks [ Eighteen Wheelers ]' started by earthmover, Nov 3, 2016.

Page 1 of 2
  1. Nov 3, 2016 #1
    earthmover

    earthmover Medium Load Member

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    Jan 27, 2009
    castalia , north carolina
    0
    1997 freightliner fld cummins 11 my fan is air clutch and I have a manual switch..problem I'm having is the fan now comes on and off at random even just driving empty . .this is a dump truck ..where at what should I be looking for . .where would the sensor that control the on off be on the motor..I know I have 1 in the surge tank but I think that's for low coolant . .also I see the air control valve by the clutch could that be going bad ..thanks
     
    earthmover, Nov 3, 2016
    earthmover, Nov 3, 2016
    #1
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  3. Nov 3, 2016 #2
    AModelCat

    AModelCat Road Train Member

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    Jul 7, 2015
    Canuckistan
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    Usually the fan on most engines is controlled by coolant temp or A/C high side pressure. Could be an issue with the sensors/switches and associated wiring. Could also be a short or wiring issue related to the manual switch.
     
    AModelCat, Nov 3, 2016
    AModelCat, Nov 3, 2016
    #2
  4. Nov 3, 2016 #3
    earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    Ok I was having problems with the ac kicking off and on right at the end of the summer ..is that the same switch ..
     
    earthmover, Nov 3, 2016
    earthmover, Nov 3, 2016
    #3
  5. Nov 3, 2016 #4
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Maybe: Does it have a four wire switch on top of the dryer? That is an all in one called a trinary switch. What are your a/c pressures running. About 275-325 on high side should cause engine fan to come on. Does it do it with a/c and defroster turned off?
     
    BoxCarKidd, Nov 3, 2016
    BoxCarKidd, Nov 3, 2016
    #4
  7. Nov 4, 2016 #5
    wrenchman

    wrenchman Bobtail Member

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    Nov 4, 2016
    0
    Also, I have run into where Flr ran there control for the fan on the M11s on the front RH side of the engine and the wiring will chaff and short and command the fan on/off when least expected and very inconsistantly, something to look at. Take care, good luck.
     
    wrenchman, Nov 4, 2016
    wrenchman, Nov 4, 2016
    #5
  8. Nov 9, 2016 #6
    earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    No it has 2 wire plug on top of it..
     
    earthmover, Nov 9, 2016
    earthmover, Nov 9, 2016
    #6
  9. Nov 9, 2016 #7
    earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    I check wiring from fan back didn't find anything . .
     
    earthmover, Nov 9, 2016
    earthmover, Nov 9, 2016
    #7
  10. Nov 14, 2016 #8
    earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    Looks like I have to switches on the dryer ..


    [​IMG]
     
    earthmover, Nov 14, 2016
    earthmover, Nov 14, 2016
    #8
  11. Nov 18, 2016 #9
    earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    You guys think 1 of the switches on the dryer could be the problem
     
    earthmover, Nov 18, 2016
    earthmover, Nov 18, 2016
    #9
  12. Nov 19, 2016 #10
    BoxCarKidd

    BoxCarKidd Road Train Member

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    yes but check it out or have it checked out. Don't just swap parts.
     
    BoxCarKidd, Nov 19, 2016
    BoxCarKidd, Nov 19, 2016
    #10
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