Hi @hchun70596
If this is the same laptop that has the bent chassis, then perhaps the fan has become disconnected from the motherboard due to that problem.
Here's the hardware maintenance manual for the laptop.
Go to p.46 to view the procedure to remove the fan. This will allow you to check the fan cable connection and also ascertain the problem with the chassis.
It may be a good idea to add more images in your other question showing what has happened to the chassis. Initially it looks like the hinges may have come loose but the image doesn't show it too well. Here's how to add images to an existing question on ifixit Adding images to an existing question
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