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COOLING SYSTEM
7 - 1 9
p a i r i n g the leak, d r a i n t h e transmission a n d torque
converter w h i l e hot. Remove t h e transmission o i l pan
and inspect sludge and/or r u s t . Inspect for a d i r t y or
plugged i n l e t filter. I f none o f these conditions are
found, the transmission m a y n o t require recondition-
i n g . Refer t o Group 2 1 for automatic transmission
servicing.
TRANSMISSION
OIL-TO-AIR
COOLER
O i l to a i r transmission coolers are mounted ahead
of t h e radiator a n d operate i n conjunction w i t h t h e
m a i n cooler located i n t h e r a d i a t o r lower t a n k (Fig.
15). The transmission o i l is r o u t e d t h r o u g h t h e m a i n
cooler i n t h e radiator lower t a n k first, t h e n t h e aux-
i l i a r y cooler before r e t u r n i n g t o t h e transmission.
(FROM BOTTOM COOLER)
VIEW IN CIRCLE
J9007-75
Fig. 15 Transmission Oil-to-Air Cooler
COOLING SYSTEM FAN
Removal
(1) Disconnect battery negative cable from battery.
(2) Loosen accessory d r i v e belts. Refer to "Accesso-
r y D r i v e B e l t " section i n t h i s group.
(3) Remove fan/viscous
drive assembly t o water
pump hub m o u n t i n g bolts.
(4) Remove f a n shroud m o u n t i n g screws ( F i g . 13).
(5) Remove fan/viscous drive assembly a n d shroud
f r o m engine compartment.
(6) Remove f a n to viscous
drive u n i t m o u n t i n g
screws.
Inspection
T h e f a n c a n n o t b e r e p a i r e d i f i t i s d a m a g e d . I t
m u s t b e r e p l a c e d . I n s p e c t t h e f a n as f o l l o w s .
(1) Remove f a n a n d viscous drive assembly from
engine. Refer to Removal procedure.
(2) Disconnect f a n from viscous drive u n i t .
(3) L a y f a n o n a flat surface w i t h leading edge fac-
i n g down. W i t h t i p of blade touching flat surface, re-
place f a n i f clearance between opposite blade a n d
surface is greater t h a n 2.0mm (.090 inch). Rocking
motion o f opposite blades should not exceed 2.0mm
(.090 inch). Test a l l blades i n t h i s manner.
WARNING:
IF FAN IS NOT WITHIN SPECIFICA-
TIONS,
DO
NOT
ATTEMPT
TO
BEND
OR
STRAIGHTEN FAN.
(2) Inspect d a n assembly for cracks, bends, loose
rivets or broken welds. Replace f a n i f any damage is
found.
CAUTION: If the water pump is replaced because of
bearing or shaft damage, the mechanical cooling
fan should be inspected for fatigue cracks, loose
blades, or loose rivets that could have resulted
from excessive vibration. Replace the fan if any of
these conditions are found.
Thermal Control Fan Drive
The t h e r m a l control f a n drive consists o f t h e vis-
cous f a n drive c l u t c h and a thermostatic spring coil
mounted o n i t ' s front face. The viscous f a n drive
clutch is essentially
a silicone-fluid-filled coupling
connecting t h e f a n assembly to the fan/water pump
pulley (Fig. 16). The coupling allows t h e f a n to be
d r i v e n i n a n o r m a l manner a t low engine speeds
w h i l e l i m i t i n g t h e top speed of the f a n to a predeter-
m i n e d m a x i m u m level at higher engine speeds.
Fig. 16 Thermal Control Fan Drive
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