old hardware / minimal netinstall -> CPU fan control

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I have just installed CentOS 6 i386 onto an old rack server (it's gonna be a 
Bacula storeage server and is a 1U 1/2 depth chassis)

I did a minimum netinstall and so far so good. However, I have one problem.  
The CPU fan is going at full speed constantly. Not a real problem apart from 
(a) it will affect the fan's lifespan and (b) it's noisy.

I've done some Googling and found some help. I've installed lm_sensors and run 

sensors-detect.

After reboot I get the following:

[root@harpo ~]# sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:       +40.0°C  (crit = +75.0°C)                  

[root@harpo ~]#

which implies that it can read the CPU temp, but the fan is still going at 
full speed.  Can anyone suggest what I need to do next to enable fan speed 
control?

[root@harpo ~]# more /etc/sysconfig/lm_sensors 
# Generated by sensors-detect on Tue Jul 11 11:49:07 2017
# This file is sourced by /etc/init.d/lm_sensors and defines the modules to
# be loaded/unloaded.
#
# The format of this file is a shell script that simply defines variables:
# HWMON_MODULES for hardware monitoring driver modules, and optionally
# BUS_MODULES for any required bus driver module (for example for I2C or SPI).

HWMON_MODULES="w83627hf"

# For compatibility reasons, modules are also listed individually as variables
#    MODULE_0, MODULE_1, MODULE_2, etc.
# You should use BUS_MODULES and HWMON_MODULES instead if possible.

MODULE_0=w83627hf
[root@harpo ~]# 
-- 
Gary 
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