5700 Manual Fan Clutch Switch Installation

Discussion in 'Western Star Forum' started by ShortCircuit, Jul 31, 2019.

  1. ShortCircuit

    ShortCircuit Bobtail Member

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    I want to install a fan clutch switch in my 5700. To my understanding I need to wire it to the fan clutch solenoid to manually engage it. Can anyone please share a wiring diagram?
     
  2. mhyn

    mhyn Road Train Member

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    no one will have wiring diagram of you truck. each truck's wiring diagram is different and you can get it from dealer. they must run your trucks vin. I want to help you. I have never opened the door of 5700 and I don't know it has Sam modules or not. What year is your truck? That truck has SAM Cab module? If it has Sam Cab then I can tell you what to do to switch on or off the fan.
     
  3. ShortCircuit

    ShortCircuit Bobtail Member

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    It’s 2017 5700XE, how can I check if I have SAM module? I have a laptop with DDDL and NexIQ interface. My only plausible plan is to wire a switch in the AC high pressure sensor, when circuit is open fan clutch is engaged. However I would like a more elegant and permanent solution without having to modify sensor wire harness.
     
  4. mhyn

    mhyn Road Train Member

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    2017 . has different module.
    your plan is a good one. it works on pre 2017 models . Try it.
    Just for info- CPC has not connected cavity and if you put toggle switch between ground and that cavity fan will come on after 5-8 second delay. Open DDDL and go to A&I DDEC manual, in help/troubleshootings. Search in A&I DDEC manual for fan activation. You will see which one is that cavity for your truck. CPC is located under dash . I Don't know exactly where in your truck. Just ask dealer where it is located.
     
    jamespmack and ShortCircuit Thank this.
  5. Commander1

    Commander1 Light Load Member

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    CPC is located behind ash tray.
     
    jamespmack and mhyn Thank this.
  6. Wombat63

    Wombat63 Bobtail Member

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    Did you end up installing the fan switch? I'd be interested to see how you ran it I'd like to do the same. Thanks
     
  7. Rolling18

    Rolling18 Light Load Member

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    I am interested in this as well for my 2017 4700..???

    I did this in my 18 KW T880 ... got the OEM smart switch. using the Nexiq and laptop paccar software told CECU it was there and activated it.. (multiplexed system)

    I would think it to be similar to W Stars??
     
  8. Rolling18

    Rolling18 Light Load Member

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    Where to get DDDL, A&I, DDEC, CPC???
    is there any other software I should obtain???
    thanks!
     
    Last edited: Oct 19, 2019
  9. ShortCircuit

    ShortCircuit Bobtail Member

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    I made a harness to go in between high pressure AC sensor and ECM harness plug. The harness has one wire split and connected to a toggle switch in the cab. Basically if AC high pressure sensor circuit is open the ECM engages fan clutch. Later I’ll buy a genuine fan button for my star but for now this works.

    AD4D701E-7CDA-49D9-B54A-D91CA92EABA9.jpeg 5E1B83AD-CF73-4477-9B24-1CEC4B7A4C0D.jpeg 53F31F1A-A5F0-4B02-9BDB-DEEBCEB8A185.jpeg
     
    mhyn Thanks this.
  10. mhyn

    mhyn Road Train Member

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    @ShortCircuit when you switch on/off the fan do you see a fault code popping up ?
     
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