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Blower fan

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mike216, May 29, 2021.

  1. May 29, 2021 #1
    mike216

    mike216 Bobtail Member

    44
    13
    Dec 15, 2013
    Cordova,Md
    0
    I have a 2016 T880 and the a/c fan motor at times will not reach full speed.I have installed a new motor and blend door actuator and still at times motor will not go to full speed.The filters have been replaced.Evaporater cleaned and all actuators for inside air,vents,and defroster are working.Any ideas?
     
    mike216, May 29, 2021
    mike216, May 29, 2021
    #1
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  3. May 29, 2021 #2
    Arctic_fox

    Arctic_fox Experienced mx13 execrator

    2,993
    12,964
    Sep 16, 2016
    0
    Bad switch likely. Had a 660 a few years back that had the same problem and swapping the switch fixed it. Could also be a short someplace.
     
    Arctic_fox, May 29, 2021
    Arctic_fox, May 29, 2021
    #2
  4. May 29, 2021 #3
    Rideandrepair

    Rideandrepair Road Train Member

    16,526
    53,942
    Aug 8, 2015
    0
    I’d suspect the blower resistor
     
    Rideandrepair, May 29, 2021
    Rideandrepair, May 29, 2021
    #3
    FLHT and truckdriver31 Thank this.
  5. May 29, 2021 #4
    truckdriver31

    truckdriver31 Road Train Member

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    8,343
    Sep 18, 2013
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    good answer. either its high or low. no in between
     
    truckdriver31, May 29, 2021
    truckdriver31, May 29, 2021
    #4
    Rideandrepair Thanks this.
  7. May 29, 2021 #5
    Banker

    Banker Road Train Member

    3,709
    9,888
    Aug 19, 2012
    0
    I have a 2015 389 and had sporadic issues with my blower not working on high speed, then the defrost not working on the dash only setting and finally the push button for A/C would not stay on. The A/C Heater control module took care of all of my problems. Yours may or may not be the same issue as mine.
     
    Banker, May 29, 2021
    Banker, May 29, 2021
    #5
    krupa530 and Rideandrepair Thank this.
  8. May 30, 2021 #6
    mike216

    mike216 Bobtail Member

    44
    13
    Dec 15, 2013
    Cordova,Md
    0
    You have to replace the whole module or just the switch?
     
    mike216, May 30, 2021
    mike216, May 30, 2021
    #6
    Rideandrepair Thanks this.
  9. May 30, 2021 #7
    mike216

    mike216 Bobtail Member

    44
    13
    Dec 15, 2013
    Cordova,Md
    0
    Dealer said the resister is on the new motor.
     
    mike216, May 30, 2021
    mike216, May 30, 2021
    #7
    Rideandrepair Thanks this.
  10. May 30, 2021 #8
    Banker

    Banker Road Train Member

    3,709
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    Aug 19, 2012
    0
    Entire module. I couldn’t find an aftermarket in my year, which are much cheaper than OEM.
     
    Banker, May 30, 2021
    Banker, May 30, 2021
    #8
    Rideandrepair Thanks this.
  11. May 31, 2021 #9
    spsauerland

    spsauerland Road Train Member

    4,296
    10,879
    May 31, 2010
    West Harrison, In
    0
    Need to first check for HVAC fault codes and software updates.
     
    spsauerland, May 31, 2021
    spsauerland, May 31, 2021
    #9
    Rideandrepair Thanks this.
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