Jeep Cherokee 2000 Service Manual - page 259
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Fan shroud
•
Radiator pressure cap
•
Thermostat
•
Coolant reserve/overflow system
•
Transmission oil cooler (if equipped with an
automatic transmission)
•
Coolant
•
Water pump
•
Hoses and hose clamps
Cooling system circulation for 2.5L/4.0L models is
shown in (Fig. 1).
AUTOMATIC TRANSMISSION OIL COOLER
DESCRIPTION
All models equipped with an automatic transmis-
sion are equipped with a transmission oil cooler
mounted internally within the radiator tank. This
internal cooler is supplied as standard equipment on
all models equipped with an automatic transmission.
Transmission oil is cooled when it passes through
this separate cooler. In case of a leak in the internal
radiator mounted transmission oil cooler, engine cool-
ant may become mixed with transmission fluid or
transmission fluid may enter engine cooling system.
Both cooling system and transmission should be
drained
and
inspected
if
the
internal
radiator
mounted transmission cooler is leaking.
An auxiliary air-to-oil transmission oil cooler is
available with most engine packages.
The auxiliary air-to-oil transmission oil cooler is
located in front of the radiator or A/C condenser (if
equipped) and behind the grill. It is mounted to the
front frame crossmember.
The auxiliary oil coolers on all models operate in
conjunction with the internal radiator mounted main
oil cooler. The transmission oil is routed through the
main cooler first, then the auxiliary cooler, before
returning to the transmission.
COOLANT RESERVE/OVERFLOW SYSTEM
DESCRIPTION
The system works along with the radiator pressure
cap. This is done by using thermal expansion and
contraction of the coolant to keep the coolant free of
trapped air. It provides:
•
A volume for coolant expansion and contraction.
•
A convenient and safe method for checking/ad-
justing coolant level at atmospheric pressure. This is
done without removing the radiator pressure cap.
•
Some reserve coolant to the radiator to cover
minor leaks and evaporation or boiling losses.
Fig. 1 Coolant Circulation—2.5L/4.0L Engines
1 – HEATER CORE
2 – TO COOLANT RESERVE/OVERFLOW TANK
3 – THERMOSTAT HOUSING
4 – RADIATOR
5 – WATER PUMP
Fig. 2 Auxiliary Transmission Oil Cooler
1 – AUXILIARY TRANSMISSION OIL COOLER
7 - 2
COOLING SYSTEM
XJ
DESCRIPTION AND OPERATION (Continued)