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cooling fan comes on at what temp

Discussion in 'Trucks [ Eighteen Wheelers ]' started by gafred99, Nov 4, 2011.

  1. Nov 4, 2011 #1
    gafred99

    gafred99 Light Load Member

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    On a 1997 3406e stock computer, with the AC off at what temp will the cooling fan come on?
     
    gafred99, Nov 4, 2011
    gafred99, Nov 4, 2011
    #1
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  3. Nov 4, 2011 #2
    Mr. Haney

    Mr. Haney Road Train Member

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    It will depend on the engine serial number and programming, but it will be either 205* F or 217* F

    More than likely it will be 205*F
     
    Mr. Haney, Nov 4, 2011
    Mr. Haney, Nov 4, 2011
    #2
  4. Nov 4, 2011 #3
    gafred99

    gafred99 Light Load Member

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    6TS or need the whole thing?
     
    gafred99, Nov 4, 2011
    gafred99, Nov 4, 2011
    #3
  5. Nov 5, 2011 #4
    Mr. Haney

    Mr. Haney Road Train Member

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    that should be 205*F

    There could be a big difference in what the gauge is reading compared to what the ECM is reading. This engine has two and possibly third temperature sensors.

    1) for the ECM

    2) for the gauge

    and a possible third sensor for a high temperature warning light and buzzer in the dash.

    The only way to be able to see if the gauge is accurate is to hook up a laptop to compare the ECM to the dash gauge. I've seen as much as a 17*F difference in some trucks between these two. The engine isn't hot, but the dash gauge is showing it much hotter than the ECM is. I'd trust the ECM coolant temperature reading, before I'd trust the dash gauge.
     
    Mr. Haney, Nov 5, 2011
    Mr. Haney, Nov 5, 2011
    #4
  7. Nov 5, 2011 #5
    gafred99

    gafred99 Light Load Member

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    I always use the digital ecm display has been more reliable info.

    I let it run at 1000 rpm for an hour to get everything warmed up, temp got to 201 never heard the fan kick on. That is with AC off.

    When I do this with AC on never gets above 195.

    Just wanted to know what settings are.
     
    gafred99, Nov 5, 2011
    gafred99, Nov 5, 2011
    #5
  8. Nov 6, 2011 #6
    mechanicallmake

    mechanicallmake Bobtail Member

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    214-217 most likely
     
    mechanicallmake, Nov 6, 2011
    mechanicallmake, Nov 6, 2011
    #6
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