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The heat that comes into the cab in most cars comes from the hot water used to cool the engine block - if dial "RED" some of the water goes through a little radiator in the bulkhead between the engine and the passenger compartment in front of the fan, and if you dial "BLUE" all of the water goes into the radiator in front of the engine block.
Running the FAN takes extra electricity, and running the AC always hurts the gas mileage.
When I used to be poor and have to run old bangers, I would find that if they started to overheat, I could drop the engine temp a few degrees by dialing RED and running the internal fan at max.
Got me home more than a few times.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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