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Inside the Dreamcast I can’t find any heatsink or any cooling unit exact a fan. I’m interested how do the Dreamcast cooldown.Can any one asnswer me? Update I mean what cooling equipment inside the Dreamcast to keep it cool and happy.

Honam 1021, the heatsink and the fan are on the left hand side of the unit, looking from behind. If you open it up and look straight down it is the front right. Here is a video on it. Hope this helps.

do the entire sega dreamcast fan guide heres a link Sega Dreamcast Fan Replacement