All seriousness aside, I think that's one of the common layman misunderstandings. The radiator in a car is not a true radiator in the sense that it employs radiative heat transfer in order to reject heat. In fact it's a heat exchanger that uses forced convection to draw heat from the radiator coils. So when someone hears that the service module had "radiators" and he hears that convective heat transfer to the ambient doesn't work in space, he might wonder what's up. The radiators in the service module were true radiators in that they simply got hot and glowed away the heat as infrared light.
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