[pdonis]

The electricity to power the fan comes from the engine. I'm not sure how much of an impact this actually is

The fan practically never runs in cold weather. The only time it's needed is in hot weather, when you're stopped or at low speed and there's not enough airflow over the radiator and/or condenser. In cold weather the thermostat controls engine temperature, not the radiator, so the fan never gets told to turn on.

[modoc]

Not the radiator/cooling fan(s), the climate control system/vent fan(s.

[pdonis]

Ah, ok. That actually does draw a significant fraction of the available power on the 12V electrical system (in my car the interior lights dim perceptibly when the climate control blower is on high), but by the standards of the engine it's still not much.