1. sudo apt-get install i8kutils
2. Reboot
3. You can now run the i8k tools such as i8kmon

Setting the fan speed to high (2) will only work shortly as the fan is somehow controlled automatically.\
This helps you out in bash:
while true; do i8kfan - 2; sleep 0.2; done

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There should be a better solution and it will be posted as soon as it's found.