Table of Contents
Advertisement
•
COOLING SYSTEM
7 - 17
Operate t h e tester p u m p t o b r i n g pressure t o 104
kPa (15 psi) o n t h e gauge. I f the pressure cap fails to
hold pressure of a t least 97 k P a (14 psi) replace cap.
Refer to C A U T I O N
below.
I f the pressure cap tests properly w h i l e positioned
on tool 7700-A, b u t w i l l n o t hold pressure or vacuum
when installed on t h e radiator, inspect t h e radiator
filler neck and cap top gasket for damage, d i r t or dis-
t o r t i o n t h a t m a y prevent t h e cap from sealing prop-
erly.
CAUTION: Tool 7700-A is very sensitive to small air
leaks which will not cause cooling system prob-
lems. A pressure cap that does not have a history
of coolant loss should not be replaced just because
it leaks slowly when tested with this tool. Add water
to the tool. Turn the tool upside down and recheck
the pressure cap to confirm that cap needs replace-
ment.
INSPECTION
H o l d cap a t eye level, r i g h t side up. The v e n t valve
(Fig. 9) a t t h e b o t t o m of the cap should open. I f the
rubber gasket has swollen a n d prevents t h e vent
valve from opening, replace t h e cap.
H o l d cap a t eye level upside down. I f any l i g h t can
be seen between v e n t valve a n d rubber gasket, re-
place cap. D o n o t u s e a r e p l a c e m e n t c a p t h a t h a s
a s p r i n g t o h o l d t h e v e n t s h u t .
A replacement cap m u s t be t h e type designed for a
coolant reserve system w i t h a completely sealed dia-
p h r a g m spring and a rubber gasket to seal to t h e r a -
diator filler neck top surface. Use of the proper cap
ensures coolant r e t u r n to t h e radiator.
RADIATOR
The radiator is a down-flow type (vertical tubes).
The radiator supplies sufficient heat transfer to cool
the engine a n d automatic transmission ( i f equipped).
RADIATOR
COOLANT
FLOW
CHECK
Use the following procedure to determine i f coolant
is flowing t h r o u g h t h e cooling system.
(1)
Idle engine
u n t i l
operating temperature is
reached. I f t h e upper r a d i a t o r hose is w a r m t o t h e
touch, the thermostat is opening and coolant is flow-
i n g to the radiator.
WARNING:
HOT,
PRESSURIZED COOLANT CAN
CAUSE INJURY BY SCALDING. USING A RAG TO
COVER THE RADIATOR PRESSURE CAP, OPEN
RADIATOR CAP SLOWLY TO THE FIRST STOP, AL-
LOWING ANY BUILT-UP PRESSURE TO VENT TO
THE RESERVE TANK. AFTER PRESSURE BUILD-UP
HAS
BEEN
RELEASED,
REMOVE
CAP
FROM
FILLER NECK.
(2) D r a i n a s m a l l amount of coolant from t h e radi-
ator u n t i l t h e ends o f t h e r a d i a t o r tubes are visible
t h r o u g h t h e filler neck. Idle t h e engine a t n o r m a l op-
e r a t i n g t e m p e r a t u r e . I f coolant i s flowing past the
exposed tubes t h e coolant is c i r c u l a t i n g .
RADIATOR
REMOVAL
(1) Disconnect b a t t e r y negative cable f r o m battery.
WARNING:
DO
NOT
REMOVE THE CYLINDER
BLOCK DRAIN PLUGS OR LOOSEN THE RADIATOR
DRAINCOCK WITH THE SYSTEM HOT AND UNDER
PRESSURE
BECAUSE
SERIOUS
BURNS
FROM
COOLANT CAN OCCUR.
(2) D r a i n t h e cooling system. Refer t o " D r a i n i n g
Cooling System".
(3) Remove hose clamps a n d hoses from radiator.
Remove coolant reserve t a n k hose f r o m radiator filler
neck nipple.
(4) I f equipped w i t h a n automatic transmission,
disconnect o i l cooler hoses at r a d i a t o r lower t a n k .
(5) Remove f a n shroud m o u n t i n g screws a n d posi-
t i o n shroud r e a r w a r d on engine (Fig. 11).
Fig. 11 Radiator and Fan Shroud
(6) Loosen r a d i a t o r lower m o u n t i n g screws t h e n re-
move t h e upper
m o u n t i n g screws.
L i f t
radiator
straight u p o u t of engine compartment t a k i n g care
not to damage r a d i a t o r cooling fins or tubes.
INSTALLATION
(1) Position shroud r e a r w a r d on engine.
(2) Slide r a d i a t o r i n t o position place behind the r a -
diator support w i t h lower m o u n t i n g holes (slots) rest-
i n g on loosened b o t t o m m o u n t i n g screws (Fig. 11).
I n s t a l l upper m o u n t i n g screws. T i g h t e n a l l m o u n t i n g
screws to 11 N * m (95 i n . lbs.) torque.
Advertisement
Table of Contents
