On my Blizzard 1230IV the 68030/50 was too hot to the touch and specially in the summers it use to crash often because of this. All these with the trapdoor cover removed of course. I don't know why ppl keep it on, anyway.
The overheating/stability problem was fixed when i removed a part of the plastic case of my A1200, just to expose the CPU and screwed a fast fan over it.