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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