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In a very, very small amount. The heater core acts much like the radiator. During the warm up cycle the coolant is blocked from the radiator by way of the thermostat. During that time the coolant is passing through the heater core. If the fan is on during that cycle it is cooling the coolant that is trying to heat up. So the answer to your question would be yes.

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Q: Does the heater in a car warm up faster when you leave the fan off?
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