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Engine fan always on

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Jeet, Jul 17, 2010.

  1. Jul 17, 2010 #1
    Jeet

    Jeet Bobtail Member

    24
    4
    Jul 17, 2010
    0
    I have a freightliner century class, engine fan is on all the time. Dash showing active fault " ac controller no response ". This used to happen everytime i get engine washed. I am suspecting ac apads gone bad.Because ac wont turn on. Should i change high pressure switch prior to replacing apads. Help is appericiated in advance. Please advice.
     
    Jeet, Jul 17, 2010
    Jeet, Jul 17, 2010
    #1
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  3. Jul 17, 2010 #2
    Hardlyevr

    Hardlyevr Road Train Member

    3,270
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    Jul 30, 2009
    Mapleton Depot,PA
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    It might be something as simple as a electrical plug being loose, or a frayed and worn wire grounding out, you might not actually need to replace the sensor.
     
    Hardlyevr, Jul 17, 2010
    Hardlyevr, Jul 17, 2010
    #2
  4. Jul 17, 2010 #3
    melpromud

    melpromud Medium Load Member

    463
    114
    Jan 29, 2010
    camden ny
    0
    High/Low pressure for the AC is bad
     
    melpromud, Jul 17, 2010
    melpromud, Jul 17, 2010
    #3
  5. Jul 18, 2010 #4
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    If you have the APADS I am thinking of then it is a small separate box somewhere under the hood with a red and green LED light on it. I know they can trip up faults pretty easily. You can reset them by cycling the key off and on 4 times real quick. Give that a try.
     
    Heavyd, Jul 18, 2010
    Heavyd, Jul 18, 2010
    #4
  7. Jul 20, 2010 #5
    Jeet

    Jeet Bobtail Member

    24
    4
    Jul 17, 2010
    0
    I do have apads, but unfortunately no lights. I know index puts lights on their apads. but not on this one. The reason i was thinking apad bad was this always happened when i got engine washed. And apads have a life of about 5 years ( as per mfg). This one is pretty old.
     
    Jeet, Jul 20, 2010
    Jeet, Jul 20, 2010
    #5
  8. Jul 21, 2010 #6
    FYDA FREIGHTLINER CINCY

    FYDA FREIGHTLINER CINCY Light Load Member

    270
    131
    Apr 28, 2009
    Cincinnati, ohio
    0
    you need a retrofit kit to do away with that system. i have attached service bulletin for the installation. part number is 681 831 00 K0
     

    Attached Files:

    FYDA FREIGHTLINER CINCY, Jul 21, 2010
    FYDA FREIGHTLINER CINCY, Jul 21, 2010
    #6
    Jeet Thanks this.
  9. Jul 25, 2010 #7
    Jeet

    Jeet Bobtail Member

    24
    4
    Jul 17, 2010
    0
    Thanks FYDA i will try replacing the apads, to binary system and postb the results back. Do i need to do any programing after i install or its just instalation of some switchs and harness.
     
    Jeet, Jul 25, 2010
    Jeet, Jul 25, 2010
    #7
  10. Jul 28, 2010 #8
    FYDA FREIGHTLINER CINCY

    FYDA FREIGHTLINER CINCY Light Load Member

    270
    131
    Apr 28, 2009
    Cincinnati, ohio
    0
    yes engine ecm will need to be programmed to 180 seconds on time. sorry for taking so long to reply.
     
    FYDA FREIGHTLINER CINCY, Jul 28, 2010
    FYDA FREIGHTLINER CINCY, Jul 28, 2010
    #8
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