e6330 problem with fan control

Hi, I have a e6330 and having an issue where the fan only spin at 70c degree.

This means that the fan is working as expected on 70c threshold. However 70c is way too high and I am not able to control it(i.e lower the threshold)

I have tried:

updated to latest bios
updated to latest chipset
updated to latest management-engine-component

install dell power management  > useless
fn+shift+15324 , fn + R > nothing comes out
install speedfan > unable to detect fan controller.

run diagnostic, FAN is healthy , maxspeed at 4k++ rpm

Is there any other way to control the FAN?