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<blockquote data-quote="homsar" data-source="post: 1891025" data-attributes="member: 408746">Thanks Patrick for your reply. I've tested using Macs Fan Control and while the HDD fan is a little rattly, all three fans spin up when I tell them to.I believe the ODD fan is the one closest to the GPU. By the time I got Macs Fan Control installed the GPU was at 65°C; setting the ODD fan to maximum (3800RPM I think) would hold the temperature there. Setting it back to Auto then caused it to continue getting hotter to 75°C; again, setting the ODD fan to maximum would stop it getting hotter. Something I hadn't noticed previously is that the CPU temperature was also gradually increasing, getting as high as 80°C, but turning the CPU fan to maximum did bring this back down. For some reason the system isn't spinning up its fans until it gets pathologically hot?I also tried using a freshly downloaded Ubuntu live USB (to eliminate any possible macOS problems). By the time I got the system booted and the lm_sensors package installed, the GPU was already at 100*C and the ODD fan was at full speed. Similarly to running macOS, the fans were silent until suddenly they span up to full speed just as I was about to check the GPU temperature.</blockquote>

[QUOTE="homsar, post: 1891025, member: 408746"] Thanks Patrick for your reply. I've tested using Macs Fan Control and while the HDD fan is a little rattly, all three fans spin up when I tell them to. I believe the ODD fan is the one closest to the GPU. By the time I got Macs Fan Control installed the GPU was at 65°C; setting the ODD fan to maximum (3800RPM I think) would hold the temperature there. Setting it back to Auto then caused it to continue getting hotter to 75°C; again, setting the ODD fan to maximum would stop it getting hotter. Something I hadn't noticed previously is that the CPU temperature was also gradually increasing, getting as high as 80°C, but turning the CPU fan to maximum did bring this back down. For some reason the system isn't spinning up its fans until it gets pathologically hot? I also tried using a freshly downloaded Ubuntu live USB (to eliminate any possible macOS problems). By the time I got the system booted and the lm_sensors package installed, the GPU was already at 100*C and the ODD fan was at full speed. Similarly to running macOS, the fans were silent until suddenly they span up to full speed just as I was about to check the GPU temperature. [/QUOTE]

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