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Take an air compressor or a can of air and spray it into the heatsink vent on the laptop. I don't know what laptop your dad has, and pics would help. No need to take it apart, spraying compressed air in ever Crack and crevice will work if dust is the problem. Trust me. I had a laptop that just at idle would get 110C. Blew it out and even sitting on my bed with blankets blocking vent holes, watching a movie it never got over 80C.
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