Perhaps a workaround: try to install i8kutils!
It worked for me, but I'm not sure if it is a real solution.
(after installing that package, both fans stopped, but they not started when 
CPU's temperature were over 60C...)

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https://bugs.launchpad.net/bugs/1602888

Title:
  Dell Inspiron 7559 fans do not shut off once started, even when cool

Status in linux package in Ubuntu:
  Triaged

Bug description:
  Running Ubuntu 16.04 on a Dell Inspiron 7559 laptop there appears to
  be an issue with the fan control. When I first boot up the machine the
  fans are off. However, after the laptop warms up under normal usage,
  the fans kick on and then never shut off again.  Even when the CPU
  cools down to below 35c, the fans will continue to run.

  If I suspend the the laptop, and then immediately wake it up again
  then fans are once again off, until it warms up again.  So
  essentially, once the fans start they don't seem to ever shut off.

  Fans seem to work normally under Windows 10.  They turn on as needed,
  and then turn off once the laptop cools down.

  I've tried the various BIOS updates that Dell has released, without
  success. I am currently running Dell's latest BIOS for this laptop
  (v1.1.8)

  Below is the output of lm-sensors showing the fans running when the
  CPU is at a cool 35c

  dell_smm-virtual-0
  Adapter: Virtual device
  Processor Fan: 1925 RPM
  Processor Fan: 2143 RPM
  CPU:            +35.0°C  
  GPU:             +1.0°C  
  SODIMM:         +49.0°C

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-28-generic 4.4.0-28.47
  ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
  Uname: Linux 4.4.0-28-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bob        1709 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Jul 13 19:18:45 2016
  HibernationDevice: RESUME=UUID=14de580b-76f3-47e4-9850-fe7637f9ff77
  InstallationDate: Installed on 2016-07-13 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  MachineType: Dell Inc. Inspiron 7559
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-28-generic.efi.signed 
root=UUID=0b3dbcf3-0bdb-4c35-9200-7bb303055a81 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-28-generic N/A
   linux-backports-modules-4.4.0-28-generic  N/A
   linux-firmware                            1.157.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/17/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.1.8
  dmi.board.name: 0H0CC0
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.1.8:bd04/17/2016:svnDellInc.:pnInspiron7559:pvr1.1.8:rvnDellInc.:rn0H0CC0:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron 7559
  dmi.product.version: 1.1.8
  dmi.sys.vendor: Dell Inc.

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