re-OSed to slackware, now fan is super loud

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http://ubuntuforums.org – I've got a "Lemur" system76 laptop, and after a disk corruption decided to try a different distro. After an hour or two playing with it, things are mostly working fine, but the fan is going full blast. I checked "top" and load is very low, nothing is hogging the CPU and the computer does not feel hot. Is there something simple that could be causing this, like missing drivers to adjust the fan? I'm not sure what tweaks System76 applies to the base Ubuntu system, if any. (Hardware)