Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

C15 engine fan won't shut off

Discussion in 'Trucks [ Eighteen Wheelers ]' started by rollin coal, Aug 31, 2011.

Page 1 of 4
  1. Aug 31, 2011 #1
    rollin coal

    rollin coal Road Train Member

    12,529
    23,859
    Mar 29, 2008
    TN
    0
    Couple of weeks ago while driving my KW with the a/c on my engine fan came on and wouldn't shut off. Sometimes it would with the a/c off and sometimes it won't. My a/c is in perfect working condition otherwise it'll freeze you out on any setting. So to make the fan go off I unhooked the high pressure a/c switch and put a paperclip in the harness to jumper it. So the fan only comes on/off manually now, have to leave it on with the a/c on if I'm parked etc. My radiator and condenser are clean, I wash them out with commercial detergent monthly. Like I said a/c is working fine. The high pressure switch is new. It sucks only having manual engine fan. Any ideas what could be the problem here?
     
    rollin coal, Aug 31, 2011
    rollin coal, Aug 31, 2011
    #1
    BRGHTSD Thanks this.
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Aug 31, 2011 #2
    SheriffJohn

    SheriffJohn Light Load Member

    54
    44
    Jul 28, 2010
    Murrieta, CA
    0
    this happened to me one time before with a cat, and the mech just replaced the fan switch to avoid any further issues...cuz it could be a 100 things. usually its a short in fan switch or the thermo sensor in the fan switch itself. good luck!
     
    SheriffJohn, Aug 31, 2011
    SheriffJohn, Aug 31, 2011
    #2
    rollin coal Thanks this.
  4. Aug 31, 2011 #3
    KW Parts Guy

    KW Parts Guy Light Load Member

    230
    78
    Jul 16, 2011
    0
    Fan overide switch send me your ser # and i'll shoot you the part number!
     
    KW Parts Guy, Aug 31, 2011
    KW Parts Guy, Aug 31, 2011
    #3
    rollin coal Thanks this.
  5. Aug 31, 2011 #4
    rollin coal

    rollin coal Road Train Member

    12,529
    23,859
    Mar 29, 2008
    TN
    0
    It's brand new. I replaced it this morning. The one it replaced was about 3 months old.
     
    rollin coal, Aug 31, 2011
    rollin coal, Aug 31, 2011
    #4
  7. Aug 31, 2011 #5
    grizzly

    grizzly Medium Load Member

    599
    432
    Aug 27, 2008
    Layton, Ut
    0
    If you have an air leak at the fan hub, that can cause it to stay on.
     
    grizzly, Aug 31, 2011
    grizzly, Aug 31, 2011
    #5
    rollin coal Thanks this.
  8. Aug 31, 2011 #6
    bender

    bender Road Train Member

    2,105
    1,348
    Jul 20, 2010
    Don't Kid Yourself
    0
    I had one that would eat those switches and after two of them found the harness to be the cause, replaced the harness and all ok.
     
    bender, Aug 31, 2011
    bender, Aug 31, 2011
    #6
    rollin coal Thanks this.
  9. Aug 31, 2011 #7
    Duke

    Duke Light Load Member

    74
    44
    Jun 14, 2007
    Minnesota
    0
    May want to check out the following areas...

    1. air leak on the little line coming from the air drier going to the pressure switch. The line may have a "rub" hole in it... if there is, will only leak motor is running or for 3-5 seconds after key is shut off.

    2. if you had a/c refrigerant added recently, may have too much oil and not enough r-134a in the system.

    Duke
     
    Duke, Aug 31, 2011
    Duke, Aug 31, 2011
    #7
    Lilman9092 and rollin coal Thank this.
  10. Aug 31, 2011 #8
    vadim2200

    vadim2200 Light Load Member

    128
    36
    Nov 21, 2010
    0
    i had it happen on my cummins, i replaced solenoid (that controls air to the fan). but u have cat
     
    vadim2200, Aug 31, 2011
    vadim2200, Aug 31, 2011
    #8
    rollin coal Thanks this.
  11. Aug 31, 2011 #9
    TURKER

    TURKER Medium Load Member

    344
    97
    Aug 11, 2009
    Raleigh NC
    0
    On the fire wall on top there is a relay with air line attached to it that controls fan clutch it is bad .Disconnect the power cord it should stop,if not check to see if you have power to it either case it is not shoting the air. Replace it it will cure the problem
     
    TURKER, Aug 31, 2011
    TURKER, Aug 31, 2011
    #9
    rollin coal Thanks this.
  12. Aug 31, 2011 #10
    blehr

    blehr Bobtail Member

    6
    2
    Jun 2, 2011
    estancia, nm
    0
    Hey Rollin Coal

    I found on my W900L the pressure switch harness was loose and the pins
    were worn and not making good contact. It is up the left side of the radiator. Check those pins and bend them over a little. Thats where I found my problem. I replaced the binary wire harness and I have not had any problems since.
     
    blehr, Aug 31, 2011
    blehr, Aug 31, 2011
    #10
    rollin coal and Leppy Thank this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

    • Page 1 of 4