Fan Speed - How to know it, when sensors is not helping?

Hello,
I’m trying to debug this warning from dmesg:

[ 4499.831488] mce: CPU5: Core temperature above threshold, cpu clock throttled (total events = 781)
[ 4499.831489] mce: CPU1: Core temperature above threshold, cpu clock throttled (total events = 781)
[ 4499.831490] mce: CPU6: Package temperature above threshold, cpu clock throttled (total events = 4092)
[ 4499.831491] mce: CPU0: Package temperature above threshold, cpu clock throttled (total events = 4092)
[ 4499.831492] mce: CPU3: Package temperature above threshold, cpu clock throttled (total events = 4092)
[ 4499.831493] mce: CPU7: Package temperature above threshold, cpu clock throttled (total events = 4092)
[ 4499.831494] mce: CPU4: Package temperature above threshold, cpu clock throttled (total events = 4092)
[ 4499.831495] mce: CPU2: Package temperature above threshold, cpu clock throttled (total events = 4092)

I know for a fact (I opened the laptop, a VivoBook ASUS, motheboard X509FB_F509FB) that the fan is working, but sensors doesn’t show any kind of information about fan speed, not even after running sensors-detect and answering YES to all probes.