Smc fan control 2.46/29/2023 ![]() The usual temperature reading there runs around 130✯ (54✬!) and often (always during malfunction or addressing error graphics lockup-freeze) exceeds a peak-hold temperature of 140✯ (60✬).Īt first I mistakenly thought forcing cooler air into the bottom might reduce this but it does not. To verify this, I installed a small temperature probe in the back top left hand (from the front) side of the back air exhaust slot (right side viewed from rear) around 20 cm (9") from edge. ![]() This top left hot air pocket-trap seems to be due to negative cabinet air pressure interfering with natural heat convection on the left side heat collects there but just can't get out! The fans are part of the problem and just don't help at all. (The rear-viewed 'right' of the top air exhaust slot). I observed that the upper left hand corner of the iMac has some sort of an air pocket that traps extreme heat from the graphics card there. I use mine to run a 54" Bravia HDTV as the extended desktop and use EyeTV and noticed numerous graphics errors lines, and failures to refresh the screen during overheating bouts. It unfortunately began to misbehave again shortly thereafter. ![]() My iMac killed its hard drive the second year of use and then the entire screen/graphics card and logic board had to be replaced at the three year mark.
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