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TJ
SERVICE PROCEDURES (Continued)
ADDING ADDITIONAL COOLANT
Do not remove radiator cap to add coolant to
system . When adding coolant to maintain correct
level, do so at coolant reserve/overflow tank . Use a
50/50 mixture of ethylene-glycol antifreeze containing
low mineral content water. Remove radiator cap only
for testing or when refilling system after service .
Removing cap unnecessarily can cause loss of coolant
and allow air to enter system, which produces corro-
sion.
SERVICE COOLANT LEVEL
The cooling system is closed and designed to main-
tain coolant level to top of radiator.
WARNING : DO NOT OPEN RADIATOR DRAINCOCK
WITH ENGINE RUNNING OR WHILE ENGINE IS HOT
AND COOLING SYSTEM IS UNDER PRESSURE.
When vehicle servicing requires a coolant level
check in radiator, drain several ounces of coolant
from radiator drain cock. Do this while observing
coolant reserve/overflow system : tank . The coolant
level in reserve/overflow tank should drop slightly. If
not, inspect for a leak between radiator and coolant
reserve/overflow system connection. Remove radiator
cap. The coolant level should be to top of radiator . If
not and if coolant level in reserve/overflow tank is at
ADD mark, check for :
" An air leak in coolant reserve/overflow tank or
its hose
" An air leak in radiator filler neck
" Leak in pressure cap seal to radiator filler neck
DRAINING COOLING SYSTEM
WARNING :
DO NOT REMOVE THE CYLINDER
BLOCK DRAIN PLUGS OR LOOSEN THE RADIATOR
DRAINCOCK WITH
SYSTEM
HOT AND UNDER
PRESSURE. SERIOUS BURNS FROM COOLANT
CAN OCCUR .
DO NOT WASTE reusable coolant . If the solution
is clean, drain the coolant into a clean container for
reuse.
DO NOT remove the radiator cap when draining
the coolant from the reserve/overflow tank . Open the
radiator draincock and when the tank is empty,
remove the radiator cap . The coolant does not have
to be removed from the tank unless the system is
being refilled with a fresh mixture .
(1) Drain the coolant from the radiator by loosen-
ing the draincock .
(2) Drain coolant from engine as follows :
On 2 .5L 4-cylinder engine by 'removing drain plug
at left rear side of block .
COOLANT
TEMPERATURE
SENSOR
COOLING SYSTEM
7 - 23
On 4 .OL 6-cylinder engine by removing the drain
plug or coolant temperature sensor on the left side of
the block (Fig. 19) .
Fig. 19 Draining Coolant-4.0L 6-Cylinder Engine
REFILLING COOLING SYSTEM
(1) Tighten the radiator draincock and the cylinder
block drain plug(s) .
(2) Fill system using a 50/50 mixture of water and
antifreeze . This is described in the Coolant section of
this group . Fill the radiator to the top and install the
radiator cap . Add sufficient coolant to the reserve/
overflow tank to raise the level to the FULL mark .
(3) Operate the engine with both the radiator cap
and reserve/overflow tank cap in place. After the
engine has reached the normal operating tempera-
ture, shut the engine off and allow it to cool .
(4) Add coolant to the reserve/overflow tank as
necessary. Only add coolant when the engine is
cold. Coolant level in a warm engine will be
higher due to thermal expansion .
REVERSE FLUSHING
Reverse flushing of the cooling system is the forc-
ing of water through the cooling system . This is done
using air pressure in the opposite direction of normal
coolant flow. It is usually only necessary with very
dirty systems with evidence of partial plugging .
REVERSE FLUSHING RADIATOR
Disconnect the radiator hoses from the radiator fit-
tings . Attach a section of radiator hose to the radia-
tor bottom outlet fitting and insert the flushing gun .
Connect a water supply hose and air supply hose to
the flushing gun .
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Troubleshooting
