If your CPU clock is constantly running at high frequency, consuming too much power and keeping the laptop constantly hot, consider using cpupower and mbpfan-git packages:
yaourt -S mbpfan-git cpupower
sudo systemctl enable mbpfan
sudo systemctl enable cpupower
The mbpfan-git controls fan actions while cpupower sets CPU governor to configured performance mode set in /etc/default/cpupower file:
# Define CPUs governor
governor='powersave'
Useful article with more configuration options: link