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The heater core is a smaller version of the radiator that is used to
keep your toes warm when it's cold outside.
The heater core is mounted under the dash board. Some of the hot
coolant is routed through this little radiator, by more hoses. A
small electric fan is also mounted there especially for the purpose
of directing the heat inside the car. To turn this fan on, you use a
switch called "fan" or "blower," located on your control panel. The
principle is exactly the same as the one used in the radiator for
your engine, except that the heat is released inside the car instead
of outside. Most engines use the heater core to warm the air coming
from the air conditioner if the dash setting is not on "cold". More
efficient designs don't do this because it makes the engine work
harder than it has to. They cycle the compressor on and off to lessen
the cooling output.
If your car is running hot, turning the heater on will help to reduce
the heat in the engine. Unfortunately, most cars don't overheat in
the winter.
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