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COOLING SYSTEM
7 - 13
(1) Start t h e engine a n d place t h e heater c o n t r o l
temperature selector i n t h e " F u l l O n " position (en-
gine vacuum is needed t o actuate t h e heater con-
trols).
(2) T u r n the i g n i t i o n off.
(3) Do not remove the r a d i a t o r cap w h e n d r a i n i n g
t h e coolant from the reserve t a n k . Open t h e r a d i a t o r
draincock a n d when t h e t a n k is empty, remove t h e
r a d i a t o r cap. I f t h e coolant reserve t a n k does n o t
d r a i n , refer t o "Testing Cooling System for L e a k s "
section i n t h i s group. T h e coolant need n o t be r e -
moved from t h e t a n k unless the system i s b e i n g r e -
f i l l e d w i t h a fresh m i x t u r e .
(4) Remove t h e cylinder block d r a i n plugs located
on the sides o f the block towards the front o f engine
j u s t above the o i l pan.
(5) Remove radiator pressure cap.
REFILLING THE COOLING SYSTEM
Clean cooling system p r i o r t o r e f i l l i n g . Refer t o
"Cooling System C l e a n i n g " section o f t h i s group.
(1) I n s t a l l the cylinder block d r a i n plugs.
(2) Close radiator d r a i n p l u g .
(3) F i l l the cooling system w i t h a 50/50 m i x t u r e o f
w a t e r and anti-freeze.
(4) F i l l coolant reserve t a n k t o t h e " M A X " m a r k .
(5) Start and operate engine u n t i l t h e r m o s t a t opens
(upper radiator hose w a r m t o touch).
(6) I f necessary, add 50/50 w a t e r a n d anti-freeze
m i x t u r e to the coolant reserve t a n k t o m a i n t a i n cool-
a n t level between the " M A X " and " M I N " m a r k s . T h e
level i n the reserve t a n k may drop below t h e " M I N "
m a r k after three or four w a r m - u p and cool d o w n cy-
cles.
COOLING SYSTEM CLEANING, REVERSE
FLUSHING
CLEANING
D r a i n cooling system a n d r e f i l l w i t h water. R u n
engine w i t h radiator cap i n s t a l l e d u n t i l upper r a d i a -
t o r hose is hot. Stop engine a n d d r a i n w a t e r f r o m
system. I f water is d i r t y , f i l l system w i t h w a t e r , r u n
engine, and d r a i n system. Repeat u n t i l w a t e r d r a i n s
clean.
REVERSE
FLUSHING
Reverse f l u s h i n g of t h e cooling system i s t h e forc-
i n g o f water t h r o u g h t h e cooling system, u s i n g a i r
pressure, i n the opposite direction o f n o r m a l coolant
flow. This is usually only necessary w i t h very d i r t y
systems w i t h evidence o f p a r t i a l p l u g g i n g .
REVERSE
FLUSHING
RADIATOR
Disconnect t h e radiator hoses from t h e r a d i a t o r i n -
let a n d outlet. A t t a c h a section o f r a d i a t o r hose t o
the radiator bottom outlet f i t t i n g a n d i n s e r t t h e
f l u s h i n g g u n . Connect a water supply hose a n d a i r
supply hose t o the f l u s h i n g g u n .
CAUTION: Internal radiator pressure must not ex-
ceed 138 kPa (20 psi) as damage to radiator may re-
sult.
A l l o w t h e r a d i a t o r t o f i l l w i t h water. W h e n t h e r a -
diator is filled, apply a i r i n short blasts, a l l o w i n g the
radiator t o r e f i l l between blasts. Continue t h i s r e -
verse f l u s h i n g u n t i l clean water flows o u t t h r o u g h
rear the r a d i a t o r cooling tube passages, have t h e r a -
diator cleaned more extensively b y a r a d i a t o r repair
shop.
REVERSE
FLUSHING
ENGINE
D r a i n t h e cooling system. Remove t h e thermostat
housing and thermostat. I n s t a l l the thermostat hous-
i n g . Disconnect the r a d i a t o r upper hose from t h e r a -
diator a n d a t t a c h t h e f l u s h i n g g u n t o t h e hose.
Disconnect t h e radiator lower hose f r o m t h e water
pump a n d a t t a c h a lead away hose t o t h e water
p u m p i n l e t f i t t i n g .
CAUTION: Ensure the heater control valve is closed
(heat off). This will prevent coolant flow with scale
and other deposits from entering the heater core.
Connect t h e water supply hose and a i r supply hose
to t h e f l u s h i n g gun. A l l o w the engine t o f i l l w i t h wa-
ter. W h e n t h e engine i s filled, apply a i r i n short
blasts, a l l o w i n g the system t o f i l l between a i r blasts.
Continue u n t i l clean water flows t h r o u g h t h e lead
away hose.
Remove t h e lead away hose, f l u s h i n g g u n , w a t e r
supply hose and a i r supply hose. Remove the thermo-
stat housing a n d i n s t a l l t h e thermostat. I n s t a l l t h e
thermostat housing w i t h a replacement gasket. Refer
to Thermostat Replacement.
Connect t h e radiator
hoses. R e f i l l t h e cooling system w i t h the correct an-
tifreeze/water m i x t u r e . Refer t o " R e f i l l i n g the cooling
System"
CHEMICAL
CLEANING
I n some instances, t h e use o f a radiator cleaner
(Mopar Radiator K l e e n , or equivalent) before flush-
i n g w i l l soften scale and other deposits and a i d t h e
f l u s h i n g operation.
CAUTION: Follow manufacturers instructions when
using these products.
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