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Hoses are used to connect the engine and the water pump to the
radiator. Radiator hoses are made of flexible rubber; size varies
depending upon the type of engine. Smaller hoses run to the heater
core, these are known as (you guessed it) heater hoses.
Three types of hoses are; the common hose, the molded or shaped hose,
and the accordion type hose. All of these hoses may have spiral wire
in their construction. Spiral wire can be molded or inserted into the
hoses, in the required shape, when the hose is constructed.
The common hose is straight and cannot take much bending before
collapsing. It is made of rubber with fabric reinforcement.
Molded or shaped hoses are the same as the common hose with one
exception. They will not collapse when bent, because all of the bends
that they need are already molded into them.
Accordion type hoses not only put up with all kinds of severe
bending, but they also absorb some of the vibration between the
engine and the radiator.
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