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JA
GENERAL INFORMATION (Continued)
WATER PUMP—2.5L ENGINE
The 2.5L pump bolts directly to the engine block
uses a gasket for pump to block sealing (Fig. 10). The
pump is serviced as an assembly.
The water pump is driven by the timing belt. See
Timing Belt in Group 9, Engine for component
removal providing access to water pump.
Fig. 10 Water Pump—2.5L Engine
WATER PUMP INLET TUBE—2.0/2.4L
ENGINES
The inlet tube connects the water pump to the
radiator and heater core. This tube is sealed by an
O-ring and held in place by fasteners to the block.
COOLANT
The cooling system is designed around the coolant.
The coolant must accept heat from engine block
metal and in the cylinder head area near the exhaust
valves. Then coolant carries this heat to the radiator
where the tube/fin assemblies of these components
can give off the heat to the air.
Mopar
Antifreeze or the equivalent is recom-
mended for optimum cooling performance and corro-
sion protection when mixed to a freeze point of -37° C
(-35° F).
COOLANT REPLACEMENT
Refer to Group 0, Lubrication and Maintenance for
schedule.
COOLING SYSTEM PRESSURE CAP
The cooling system is equipped with a pressure cap
that releases pressure at some point within a range
of 97-124 kPa (14-18 psi) (Fig. 11).
The system will operate at higher than atmo-
spheric pressure, which raises the coolant boiling
point, allowing increased radiator cooling capacity.
There is a vent valve in the center of the cap that
allows a small coolant flow to the CRS tank. If the
valve is stuck shut, the radiator hoses will col-
lapse on cool-down. Clean the vent valve (Fig.
11) to ensure proper sealing when boiling point
is reached.
Fig. 11 Cooling System Pressure Cap to Filler Neck
There is a gasket in the cap that seals to the top of
the filler neck so that vacuum is maintained to draw
coolant back into the system from the coolant reserve
system tank.
RADIATOR
The radiators are cross flow types (horizontal
tubes) with design features that provide greater
strength as well as sufficient heat transfer capabili-
ties to keep the engine satisfactorily cooled (Fig. 12).
CAUTION: Plastic tanks, while stronger then brass
are
subject
to
damage
wrenches.
COOLING SYSTEM FANS
All models use electric motor driven, two speed
cooling system fans. The fan modules include a motor
support and shroud. The module is fastened to the
radiator by bolts (Fig. 13).
NOTE: Attempts to reduce high temperature gauge
reading by increasing engine speed, at the same
vehicle speed, can increase high engine coolant
temperature.
AUTOMATIC TRANSMISSION OIL COOLERS
Oil coolers are internal oil to coolant type, mounted
in the radiator left tank (Fig. 14). Rubber oil lines
feed the oil cooler and the automatic transmission.
Use only approved transmission oil cooler hose. Since
these hoses are molded to fit space available, replace-
ment molded hoses are recommended. Tighten Oil
Cooler Hose Clamps to 2 N·m (18 in. lbs.).
COOLING SYSTEM
by
impact,
such
7 - 5
as
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