Sorry to hear of all the problems. Disassembling the laptop to clean fan might be the only thing that solves the heat/fan issue, along with possibly cleaning cpu & gpu chips before applying fresh thermal compound.You can find your Maintenance & Service Guide by clicking on link at top of this page titled "Support" and putting in your model.
As for salvaging files from the failed/failing hdd, you could remove it and put it into a USB Enclosure then plug it into usb port of another machine. If there is any life left in it you should be able to browse the hdd just as you would an internal hdd and copy files off to hdd of host machine.
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