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Engine fan not coming on

Discussion in 'Trucks [ Eighteen Wheelers ]' started by US MARINE, Oct 6, 2012.

Page 1 of 3
  1. Oct 6, 2012 #1
    US MARINE

    US MARINE Heavy Load Member

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    Sep 15, 2011
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    2006 Freightliner Century
    515 Detroit

    The fan will not engage . I replaced the following

    1. Air cylonoid on the fire wall
    2. Fan switch on the top of the air dryer for the AC

    each of the 2 mentioned parts have a small harness with a plug if I pull either plug the fan will come on and run continuous . If they are both plugged in it will not engage even if AC is on high .

    I just got a code the said HVAC - HI and a 46# if I reset the code it comes right back but no fan still . Anything thing I'm overlooking such as HP Sensor - LP Sensor is all this connected to the big engine fan in some way ? could it be a broken wire

    at a loss need help
     
    US MARINE, Oct 6, 2012
    US MARINE, Oct 6, 2012
    #1
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  3. Oct 6, 2012 #2
    US MARINE

    US MARINE Heavy Load Member

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    The fan I'm speaking of is the large out side engine fan
     
    US MARINE, Oct 6, 2012
    US MARINE, Oct 6, 2012
    #2
  4. Oct 6, 2012 #3
    US MARINE

    US MARINE Heavy Load Member

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    The code is

    HVAC
    Sht Hi 146s001 03
     
    US MARINE, Oct 6, 2012
    US MARINE, Oct 6, 2012
    #3
  5. Oct 6, 2012 #4
    MNdriver

    MNdriver Road Train Member

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    146 is EGR from when I was talking with the Service manager in Fargo at Freightliner. When I go into the manual, that code is coming up as EGR, but I can't find the 001


    It's not the latest manual...

    But the one I am referencing has this on the front cover. And since it's a "2004" manual, hard to look up a code for a 2006 truck.

     
    MNdriver, Oct 6, 2012
    MNdriver, Oct 6, 2012
    #4
    US MARINE Thanks this.
  7. Oct 6, 2012 #5
    US MARINE

    US MARINE Heavy Load Member

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    Is the HVAC connected to EGR ?

    Now as far as code goes that's the code that comes up on my dash on the on board read out which is prob different from the book I think it is any way
     
    US MARINE, Oct 6, 2012
    US MARINE, Oct 6, 2012
    #5
  8. Oct 6, 2012 #6
    MNdriver

    MNdriver Road Train Member

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    The manual I have relates more to the EGR system. I am still trying to find all the supplementary books that go with it. Hard to find on the net for free.

    Working towards just buying them though.

    http://www.thetruckersreport.com/tr...tliner-forum/184518-where-to-get-manuals.html


    the 146 is the EGR system identifier though. that much is standard for all the years that were there.


    Have you been idling the truck a lot lately? I had a similar code to your (06 emission DD S60EGR) that was coming up Delta P sensor plugged. From a night of idling it after the APU belt failed. It was 90+ with 90+ humidity and the AC was a must.

    I started to drive it and the code went away. Near as we could figure it all out, it blew itself clean.
     
    MNdriver, Oct 6, 2012
    MNdriver, Oct 6, 2012
    #6
  9. Oct 6, 2012 #7
    US MARINE

    US MARINE Heavy Load Member

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    No I don't idle - APU.

    My issue us my engine fan won't come
     
    US MARINE, Oct 6, 2012
    US MARINE, Oct 6, 2012
    #7
  10. Oct 6, 2012 #8
    US MARINE

    US MARINE Heavy Load Member

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    Checked HVAC fuses = all good nothing blown
     
    US MARINE, Oct 6, 2012
    US MARINE, Oct 6, 2012
    #8
  11. Oct 6, 2012 #9
    US MARINE

    US MARINE Heavy Load Member

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    Sep 15, 2011
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    CDTC sensor ? Anyone know where or what it is ?

     
    US MARINE, Oct 6, 2012
    US MARINE, Oct 6, 2012
    #9
  12. Oct 6, 2012 #10
    bubbanbrenda

    bubbanbrenda Road Train Member

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    Middletown,Oh.
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    I'm guessing the high pressure switch for the HVAC is bad,when the head pressure on the A/C compressor get too high its supposed to turn on the fan.
     
    bubbanbrenda, Oct 6, 2012
    bubbanbrenda, Oct 6, 2012
    #10
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