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Oct 2, 2015 at 15:03 comment added JeffDror @vini_i: Thanks, I think I now understand better. I assumed a car had some sort of condenser to reduce the coolant temperature. If it only relies on air cooling then I agree this cost is not a big deal (though I am surprised this is sufficient).
Oct 2, 2015 at 9:51 comment added Captain Kenpachi It would depend mostly on what temperature the engine runs optimally at. E.g. the GM Z20LET engine is most efficient at a very toasty 97 degrees celcius. If you bring that temp down significantly, e.g. to 85, your consumption suffers slightly. You also increase wear and tear, which indirectly indicates that the engine has to work harder, and hence uses more fuel.
Oct 2, 2015 at 6:57 comment added vini_i @JeffDror What your talking about is a game of robing Paul to pay Peter. If you run the blower motor you will have to run the radiator fan less, but that is standing still. If your driving then the moving air keeps the engine cool by itself and running the blower motor is excessive. The thermostat takes not extra energy to operate and the water pump is belt driven and runs all the time anyway.
Oct 2, 2015 at 2:40 comment added JeffDror The thermostat might keep the engine temperature constant but if the engine loses heat by blowing out hot air it will take less energy to cool? I assume moderating the engine temperature requires energy?
Oct 2, 2015 at 1:39 history answered vini_i CC BY-SA 3.0