Here is a disassembly video for your laptop.
https://www.youtube.com/watch?v=ECsPFZJ4eGA
Make sure to have a can of air on hand to clear any dust clogging vents and fans.
Follow this second video to change thermal paste.
https://www.youtube.com/watch?v=wYzof8KSfPQ
If you don't have an SSD, consider switching to an SSD to lower the temperature further. Mechanical hard drives get pretty hot as well.