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COOLING SYSTEM
•
50/50 E t h y l e n e - G l y c o l a n d W a t e r -Is t h e recom-
mended m i x t u r e , i t provides protection against freez-
i n g t o -37°C (-35°F). T h e antifreeze concentration
M U S T A L W A Y S be a m i n i m u m of 44 percent, year-
r o u n d i n a l l climates. I f the percentage is lower, en-
gine parts m a y be eroded b y cavitation.
W h e r e required, a 56 percent ethylene-glycol a n d
44 percent w a t e r m i x t u r e w i l l provide a
freeze-point
of-50°F.
CAUTION: Richer mixtures cannot be measured
with normal field equipment and can cause prob-
lems associated with 100%ethylene-glycol.
COOLANT
SELECTION-ADDITIVES
T h e presence o f a l u m i n u m components i n t h e cool-
i n g system requires s t r i c t corrosion protection. M a i n -
t a i n t h e coolant a t the specified level w i t h a m i x t u r e
of ethylene glycol- based antifreeze and water. O n l y
use a n anti-freeze c o n t a i n i n g A L U G A R D
340-2 ™
such as Mopar Anti-freeze, Prestone, Peak or a n
equivalent. I f the coolant becomes contaminated or
looses color, d r a i n and flush t h e cooling system a n d
f i l l w i t h correctly m i x e d solution.
A .25% emulsifiable o i l is added t o t h e r a d i a t o r a t
the factory t o prevent solder corrosion.
CAUTION: Do not use coolant additives that are
claimed to improve engine cooling.
COOLANT
SERVICE
I t
i s recommended t h a t t h e cooling system be
d r a i n e d a n d flushed a t 84,000 kilometers (52,500
miles) or 3 years whichever occurs first. T h e n every
two years or 48,000 kilometers (30,000 miles) or 2
years whichever comes first.
COOLANT
LEVEL
CHECK-ROUTINE
D o n o t r e m o v e r a d i a t o r c a p f o r r o u t i n e c o o l a n t
l e v e l
i n s p e c t i o n s . T h e c o o l a n t
l e v e l
c a n b e
c h e c k e d a t t h e c o o l a n t r e s e r v e b o t t l e .
T h e coolant reserve system provides a q u i c k v i s u a l
method for d e t e r m i n i n g the coolant level w i t h o u t re-
m o v i n g t h e r a d i a t o r pressure cap. W i t h t h e engine
i d l i n g and a t n o r m a l operating temperature, observe
the coolant level i n t h e reserve t a n k . T h e coolant
level should be between the m i n i m u m and m a x i m u m
m a r k s .
ADDING ADDITIONAL
COOLANT-ROUTINE
D o n o t r e m o v e t h e r a d i a t o r c a p t o a d d c o o l a n t
t o t h e s y s t e m .
W h e n adding coolant to m a i n t a i n the correct level,
do so a t the coolant reserve bottle w i t h a 50/50 m i x -
t u r e
of
ethylene-glycol
antifreeze
( c o n t a i n i n g
A l u g a r d 340-2) and water. Remove t h e r a d i a t o r cap
only for t e s t i n g or w h e n r e f i l l i n g t h e system after
service. Removing t h e cap unnecessarily c a n cause
loss o f coolant a n d a l l o w a i r t o enter t h e system,
w h i c h produces corrosion.
COOLANT
LEVEL
CHECK-SERVICE
The cooling system i s closed a n d designed t o m a i n -
t a i n coolant level t o the top o f t h e r a d i a t o r .
W h e n vehicle servicing requires a coolant level
check i n the radiator, w i t h e n g i n e o f f a n d t h e c o o l -
i n g s y s t e m n o t u n d e r p r e s s u r e ( c o l d ) ,
d r a i n several ounces o f coolant from t h e r a d i a t o r
d r a i n cock w h i l e observing t h e coolant reserve sys-
t e m (CRS) t a n k . T h e coolant level i n t h e reserve
t a n k should drop s l i g h t l y . I f not, inspect for a leak
between t h e radiator a n d coolant reserve system con-
nection. Remove t h e r a d i a t o r cap. T h e coolant level
should be t o the top o f t h e r a d i a t o r . I f not, a n d i f t h e
coolant level i n t h e reserve t a n k i s a t t h e " M I N "
m a r k , a n a i r leak exists i n the coolant reserve t a n k
or r a d i a t o r filler neck, or t h e pressure cap seal t o t h e
radiator f i l l e r neck leaks.
LOW COOLANT
LEVEL-AERATION
I f t h e coolant level i n t h e r a d i a t o r drops below t h e
top o f t h e radiator core tubes a i r w i l l enter the sys-
tem.
Low coolant level can cause t h e t h e r m o s t a t pellet
to be suspended i n a i r instead o f coolant. T h i s w i l l
cause t h e thermostat t o open l a t e r w h i c h i n t u r n
causes h i g h e r coolant temperature. A i r trapped i n
cooling system also reduces t h e a m o u n t o f coolant
c i r c u l a t i n g i n t h e heater core r e s u l t i n g i n l o w heat
output.
DEAERATION
As t h e engine operates, a i r trapped i n t h e cooling
system gathers under the r a d i a t o r cap. T h e n e x t t i m e
engine is operated t h e r m a l expansion o f coolant w i l l
push trapped a i r past r a d i a t o r cap i n t o coolant re-
serve t a n k where i t escapes t o atmosphere i n the bot-
tle. W h e n engine cools down coolant w i l l be d r a w n
from reserve bottle i n t o r a d i a t o r t o replace removed
air.
DRAINING COOLING SYSTEM
WARNING: DO NOT REMOVE
THE CYLINDER
BLOCK DRAIN PLUGS OR LOOSEN THE RADIATOR
DRAINCOCK
WITH SYSTEM
HOT AND UNDER
PRESSURE BECAUSE SERIOUS
BURNS
FROM
COOLANT CAN OCCUR.
D O N O T W A S T E reusable coolant. I f t h e solution
is clean and is being drained only t o service t h e en-
gine or cooling system, d r a i n t h e coolant i n t o a clean
container for reuse.
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