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Jason, you fail to realize the enviroment you are refering to is quite different than the near vacuum of open space, and therefor totally irrelevant..
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The electronics inside apollo did not work in a near vacuum but in the cabin's atmosphere. Even if electronics are placed in a vacuum, the electrical currents running through conductors with electrical resistance will generate heat.
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My guess is the circuits were very efficient and produced very little heat.
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What is efficient? Electronics require certain currents. And those current generate heat. a more efficient system will draw less current to do the same task and hence produce less heat, but you'll always have a required amount of "juice" ie current to run a thing, hence a basic amount of current you simply need. And hence a basic amount of heat. So whether the apollo electronics were efficient or not, they will have produced heat (as said, super conductors are out of the question) The cooling system was designed for the heat the electronics produced, A13 switched the electronics off, no heat, same amount of cooling, hence too cool craft.