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7 - 20
COOLING SYSTEM
•
The thermostatic s p r i n g coil reacts t o the tempera-
t u r e o f the r a d i a t o r discharge a i r a n d engages t h e
drive c l u t c h for h i g h e r f a n speed i f t h e a i r tempera-
t u r e from t h e r a d i a t o r rises above a certain point.
U n t i l a d d i t i o n a l engine cooling is necessary, the fan
w i l l r e m a i n a t a reduced R P M regardless o f engine
speed. O n l y w h e n sufficient heat is present i n the a i r
flowing
t h r o u g h t h e r a d i a t o r core t o cause a reaction
from
t h e thermostatic s p r i n g coil w i l l t h e viscous
drive clutch engage a n d increase fan speed to provide
t h e necessary a d d i t i o n a l engine cooling.
Regardless o f increased engine speed, once the f a n
has reached i t s m a x i m u m operating speed i t w i l l not
rotate any faster. W h e n t h e necessary engine cooling
has been accomplished causing a reduction i n t h e
temperature o f t h e r a d i a t o r discharge a i r , the spring
coil again reacts a n d the f a n speed i s reduced t o the
previous disengaged speed.
Fan Installation
(1) I n s t a l l fan t o viscous d r i v e u n i t . T i g h t e n mount-
i n g screws t o 23 N n n (17 ft-lbs) torque.
(2) I n s t a l l fan/viscous d r i v e assembly a n d shroud.
T i g h t e n fan/viscous drive assembly t o w a t e r p u m p
hub m o u n t i n g screws t o 23 N
#
m (17 ft-lbs) torque.
T i g h t e n shroud m o u n t i n g screws t o 11 N n n (95 i n -
lbs) torque.
(3) I n s t a l l a n d tension accessory d r i v e belts. Refer
to "Accessory D r i v e B e l t " section i n t h i s group.
(4) Connect b a t t e r y negative cable t o negative ter-
m i n a l o f battery.
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