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Replace laptop fan with passive cooling
(lemmy.ml)
It may not boot if you simply remove it. Often a laptop POST will check for the fan at boot.
Replace it. You can probably find one on eBay for a few dollars.
I recently replaced one in a 10+ year old Thinkpad for $10
Edit: Though I admire your ingenuity and commitment with the giant heat sink idea!
You may wanna post the laptop brand, model and a few pictures of the stock cooler and the CPU bellow it so people know what you're talking about.