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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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Isn't there a thermostat bypass on most cars that allows a portion of the coolant to pass through the heater core before the thermostat reaches sufficient temperature to open?