PRIN. OF INTERNAL COMBUSTION ENGINES - OD1619 LESSON 2/TASK 3
configurations of frontwheel drive vehicles with transversely mounted engines, the
electric fan is a necessity because the end of the engine is not located directly
behind the radiator. Description and operation of the fan is as follows:
FIGURE 68. ELECTRICALLY MOTORIZED FAN.
(a) The fan blade is mounted on the motor shaft. The motor and fan blade
assembly is then mounted directly behind the radiator core.
(b) The fan receives electric current through the ignition switch and a
temperature sensitive switch located at the bottom of the radiator. The purpose of
this radiator thermal switch is to turn on the fan to provide cooling whenever the
temperature of the coolant reaches approximately 210 F (98.8 C). This serves to
allow the fan to run only when needed.
(c) Some models incorporate a timed relay that allows the fan to run for a
short time after engine shutdown. This, in conjunction with thermosiphon action in
the cooling system, helps to prevent boilover after engine shutdown.
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