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Fan runs for no reason

Discussion in 'Trucks [ Eighteen Wheelers ]' started by oicu812, Dec 15, 2016.

  1. Dec 15, 2016 #1
    oicu812

    oicu812 Medium Load Member

    637
    714
    Sep 24, 2010
    Wisconsin
    0
    I have a 6NZ and the fan comes on for no apparent reason. Engine temp is good, coolant level also. Defrost and air conditioning off. Fan switch off. Outside temps are low. It does it intermittently. Sometimes it doesn't happen for a week, then it will do it for a day or a week. There doesn't seem to be any rhyme or reason for it. Am I looking at a sending unit or solenoid problem? I had a mechanic look at it a while back and there were no over temp logs in the ECM or anything else obvious that he saw that was going on. Has me stumped. Thanks for any input.
     
    oicu812, Dec 15, 2016
    oicu812, Dec 15, 2016
    #1
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  3. Dec 15, 2016 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

    4,525
    6,586
    Aug 26, 2014
    0
    What kind of wagon you got?
     
    BoxCarKidd, Dec 15, 2016
    BoxCarKidd, Dec 15, 2016
    #2
  4. Dec 15, 2016 #3
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,817
    1,783
    Jun 14, 2009
    romulus,mi
    0
    Find your fan clutch solenoid, usually on driver side firewall. With air tanks full, key on, engine off you should have 12v+key power on one wire and ground supplied by ECM on other wire. This opens your solenoid and allows air to go to fan clutch. Disruption of signals in either of these wires will cause the fan to stay on. On a Cat it is more than likely the wire from the ECM to the solenoid.
     
    QUALITYTRUCK, Dec 15, 2016
    QUALITYTRUCK, Dec 15, 2016
    #3
    oicu812 Thanks this.
  5. Dec 15, 2016 #4
    Hurricane69

    Hurricane69 Road Train Member

    4,421
    59,740
    Sep 10, 2008
    Iowa
    0
    Fixed mine tonight after chasing it for awhile.... Air intake sensor was reading 175 idling in the drive at 13°... Unplugged it and fan shut off. Changed sensor now reading 51°. Everything working correctly. Not saying this is your problem.. Could be alot of things....that's why they call it troubleshooting.
     
    Hurricane69, Dec 15, 2016
    Hurricane69, Dec 15, 2016
    #4
    oicu812, 04 LowMax and SL3406 Thank this.
  7. Dec 15, 2016 #5
    earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    Where would the air intake sensor be on a 97 cummins m11..
     
    earthmover, Dec 15, 2016
    earthmover, Dec 15, 2016
    #5
  8. Dec 16, 2016 #6
    oicu812

    oicu812 Medium Load Member

    637
    714
    Sep 24, 2010
    Wisconsin
    0
    Thanks, this gives me some places to start looking.
     
    oicu812, Dec 16, 2016
    oicu812, Dec 16, 2016
    #6
  9. Feb 6, 2017 #7
    earthmover

    earthmover Medium Load Member

    563
    20
    Jan 27, 2009
    castalia , north carolina
    0
    Ok guys here is a picture of the gauges with the ac running how do I tell if it's the high pressure switch or not..



    [​IMG]
     
    earthmover, Feb 6, 2017
    earthmover, Feb 6, 2017
    #7
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