fan belt

noun
(in automotive vehicles) a belt, driven by the crankshaft of an engine, that turns a fan for drawing cooling air through the radiator.

Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fan belt
 
n
any belt that drives a fan, esp the belt that drives a cooling fan together with a dynamo or alternator in a car engine

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
For instance, by checking the fan belt, its potential to break while on route can be reduced.
It is wise to bring an extra fan belt, fuses, and other spare parts.
If this fan belt breaks, the area served by the air handling unit may be without ventilation.
Miners were replacing the fan belt on the excavator as directed by the supervisor.
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