Engine Accessory Drive Belt Description; Coolant Tank Description; Coolant Description; Low Coolant Level Sensor Description And Operation - Jeep 200 Cherokee Service Manual

XJ
DESCRIPTION AND OPERATION (Continued)
RADIATOR
DESCRIPTION
The radiator used with the 2.5L diesel is con-
structed of a horizontal flow aluminum core with
plastic side tanks.
CAUTION: Plastic tanks, while stronger than brass,
are subject to damage
wrenches.
ENGINE ACCESSORY DRIVE BELT
DESCRIPTION
The accessory drive components are operated by a
single, crankshaft driven, serpentine drive belt. An
automatic belt tensioner is used to maintain correct
belt tension at all times.
CAUTION: When installing a serpentine accessory
drive belt, the belt MUST be routed correctly. If not,
the engine may overheat due to water pump rotat-
ing in wrong direction.
COOLANT TANK
DESCRIPTION
A pressurized, plastic coolant tank is used with
this cooling system (Fig. 2). The tank is located at
the right-rear side of the engine compartment and is
mounted as the highest point of the cooling system.
This allows any air or vapor exceeding the pressure/
vent cap rating to escape through the cap. Coolant
flows through the tank at all times during engine
operation whether the engine is cold or at normal
operating temperature. The coolant tank is equipped
with a threaded pressure/vent cap. Refer to Pressure/
Vent Cap for additional information.
The low coolant level sensor is located near the
bottom of the tank (Fig. 2).
WATER PUMP
DESCRIPTION
A centrifugal water
through the water jackets, passages, water manifold,
radiator core, pressurized coolant tank, cooling sys-
tem hoses and heater core. The pump is driven from
the engine crankshaft by a drive belt. The water
pump is bolted to the water pump adapter (Fig. 3).
The water pump adapter is bolted to the engine.
The water pump impeller is pressed onto the rear
of a shaft that rotates in bearings pressed into the
housing. The bottom of the housing is equipped with
a small vent tube (Fig. 3) to allow seepage to escape.
2000 JEEP CHEROKEE
by impact, such as
pump circulates coolant
Fig. 2 Pressurized Coolant Tank
1 – LOW COOLANT LEVEL SWITCH
2 – COOLANT RESERVOIR
3 – LOW COOLANT LEVEL SWITCH HARNESS CONNECTOR
A drain hose is attached to this tube. The water
pump seals is lubricated by the antifreeze in the cool-
ant mixture. No additional lubrication is necessary.
A rubber o-ring (instead of a gasket) is used as a
seal between the water pump and the water pump
adapter (Fig. 3).
A quick test to determine if the pump is working is
to check if the heater warms properly. A defective
water pump will not be able to circulate heated cool-
ant through the heater hoses and the heater core.
COOLANT
DESCRIPTION
Coolant flows through the engine water jackets
and cylinder heads absorbing heat produced by the
engine during operation. The coolant carries heat to
the radiator and heater core. Here it is transferred to
the ambient air passing through the radiator and
heater core fins.
LOW COOLANT LEVEL SENSOR
DESCRIPTION
The low coolant level sensor checks for low coolant
level in the coolant tank (Fig. 4).
OPERATION
When the coolant level gets low a signal will be
sent from this sensor to the powertrain control mod-
ule (PCM). When the PCM determines low coolant
level, the instrument panel mounted low coolant level
warning lamp is illuminated. The sensor is located
COOLING SYSTEM 7 - 3