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Originally Posted by MrSelfDestruct
The thermostat won't open until the coolant reaches a certain temperature, so the fan/etc. won't affect that. Once it does, it's just another area for the coolant to flow through and disperse heat. The engine heats up more slowly this way.
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On all the cars I've encountered, the thermostat only controls flow through the radiator. Coolant always flows thru the heater core. And I can always feel a little bit of heat through the vents before the engine gets up to operating temperature as well.