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2000 International 9400i No heat weak air flow

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by TJ_BASS, Dec 22, 2022.

  1. Dec 22, 2022 #1
    TJ_BASS

    TJ_BASS Bobtail Member

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    Oct 25, 2021
    0
    Hey guys I'm having a problem with no hot air in my 9400i eagle pro sleeper.
    Symptoms are: No heat, weak air flow for both ac and heat, no hot air in bunk or front. Also I think the air selector for defrost etc does not work properly.
    Any idea where to look? Haven't gotten a chance to really take a look at it and will be tackling it tomorrow.
    Truck was in pretty poor shape and pretty dirty but not impossible to clean, air filter looked like its haven't been changed in years.
    Any help is appreciated!
    VIN: 3HSCEAMR0YN045186
    Engine: 1999 60 Series Detroit
     
    TJ_BASS, Dec 22, 2022
    TJ_BASS, Dec 22, 2022
    #1
    blairandgretchen Thanks this.
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  3. Dec 22, 2022 #2
    TJ_BASS

    TJ_BASS Bobtail Member

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    Oct 25, 2021
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    Also Note its stuck on AC cold air, not a hint of heat.
     
    TJ_BASS, Dec 22, 2022
    TJ_BASS, Dec 22, 2022
    #2
  4. Dec 22, 2022 #3
    kwswan

    kwswan Road Train Member

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    mcminnville,tn.
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    Are the hot water valves open for heat?
     
    kwswan, Dec 22, 2022
    kwswan, Dec 22, 2022
    #3
    Rideandrepair and singlescrewshaker Thank this.
  5. Dec 23, 2022 #4
    TJ_BASS

    TJ_BASS Bobtail Member

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    Oct 25, 2021
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    I am not sure, but I did try following these coolant lines that seems like it goes to the heater core, I turned a valve but nothing really changed, I can take a picture of what I was adjusting when I'm around the truck.
     
    TJ_BASS, Dec 23, 2022
    TJ_BASS, Dec 23, 2022
    #4
    Rideandrepair and singlescrewshaker Thank this.
  7. Dec 23, 2022 #5
    kwswan

    kwswan Road Train Member

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    mcminnville,tn.
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    There should be 1 coming off the water pump and another one off the oil cooler. Look between the turbo and the block for the second one. At least that is the way my Internationals with Detroits have been plumbed.
     
    kwswan, Dec 23, 2022
    kwswan, Dec 23, 2022
    #5
    Rideandrepair Thanks this.
  8. Dec 23, 2022 #6
    TJ_BASS

    TJ_BASS Bobtail Member

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    Oct 25, 2021
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    Will do! I will let you know if I notice a difference!
     
    TJ_BASS, Dec 23, 2022
    TJ_BASS, Dec 23, 2022
    #6
    Rideandrepair Thanks this.
  9. Dec 23, 2022 #7
    blairandgretchen

    blairandgretchen Road Train Member

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    Dec 9, 2011
    South west Missouri
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    If that air filter was nasty - I’d guess that the little heater cores will need some crud blown out of them, which will improve airflow.
     
    blairandgretchen, Dec 23, 2022
    blairandgretchen, Dec 23, 2022
    #7
    TJ_BASS, Rideandrepair and JoeyJunk Thank this.
  10. Dec 23, 2022 #8
    ChuckMartel

    ChuckMartel Light Load Member

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    Jan 22, 2021
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    If none of the other suggestions work, remove your passenger seat and watch the doors when you change settings, those are bad for door binding or actuators failing.
     
    ChuckMartel, Dec 23, 2022
    ChuckMartel, Dec 23, 2022
    #8
    TJ_BASS and Rideandrepair Thank this.
  11. Mar 13, 2023 #9
    TJ_BASS

    TJ_BASS Bobtail Member

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    Oct 25, 2021
    0
    Problem has been solve it was just the valve near the water pump as you said I Finnaly got to it
     
    TJ_BASS, Mar 13, 2023
    TJ_BASS, Mar 13, 2023
    #9
    Concorde Thanks this.
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