•
COOLING
SYSTEM
7 - 1
COOLING SYSTEM
GENERAL
INFORMATION
This
group contains
changes
made
to the diesel
cooling
system during the mid-1991 model year. The
main
change
is a new higher capacity cross-flow ra-
diator.
The cooling system capacities
have
changed
as a result of the new radiator.
RADIATOR
A
cross-flow radiator is used in the
mid-1991
model
year. The radiator cools the engine and automatic
transmission
(if
equipped).
REMOVAL
(1)
Disconnect battery negative cable
from
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)
Drain
the cooling system. Refer to
Draining
Cooling
System in the 1991
Rear
Wheel
Drive
Truck
Service Manual.
(3)
Remove
hose
clamps and
hoses
from
radiator.
Remove coolant
reserve
tank
hose
from
radiator
filler
neck nipple.
(4)
Remove fan shroud retaining clips. The shroud
has two
tabs
that fit into clips in the bottom of the
radiator.
Lift
the shroud up and position it back onto
the engine (Fig. 1).
(5)
Remove radiator top mounting brackets. The
brackets fit over support dowels on the radiator
inlet
tank (Fig. 1).
(6)
The bottom of the radiator has two dowels that
fit
into
holes in the lower support panel. Taking
care
not
to
damage
radiator cooling fins or tubes,
lift
ra-
Fig.
1
Radiator
and Fan
Shroud
diator
straight up out of engine compartment.
INSTALLATION
(1)
Position shroud rearward on engine.
(2)
Lower radiator into
position.
The dowels on the
bottom
of the radiator fit into alignment holes in the
lower
support panel.
(3)
Install
top mounting brackets. Tighten mount-
ing
screws to 23 N»m (17 in. lbs.) torque.
(4)
Connect radiator
hoses.
Install
hose
clamps.
(5)
Position fan shroud on radiator flange.
Install
retaining
clips.
(6)
Open
heater
valve.
(7) Fill
cooling system
with
coolant. Refer to
Fill-
ing
Cooling System in the 1991
Rear
Wheel
Drive
Truck
Service Manual.
(8)
Operate engine
until
it
reaches
normal temper-
ature. Check cooling system.
SPECIFICATIONS
COOLING
SYSTEM
CAPACITIES
RADIATOR
FAN
CAPACITY
IMINI
MOML
A
m
WIDTH
INCHES
IHKK-
NISS
ROWS
OF
TUBES
HNS
MR
INCH
DIAMETBR
INCHES
NO.
OP
BLADES
PITCH
INCH
CLWTCH
•NOAOIMINT
T1MMRATURI
QUARTS
units
Diesel
All
26
2.25 3
13 22.0
7
2.20
140°F
17.0
16.1
Diesel
All
•
26
2.25
3
13 22.0
7
2.20
140
°F
16.0 15.1
39107
881
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