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7 - 42
ENGINE
THERMOSTAT HOUSING (Continued)
INSTALLATION - 2.4L
(1) Clean all gasket sealing surfaces.
(2) Install gasket and housing (Fig. 34). Tighten
bolts to 28 N·m (20 ft. lbs.).
(3) Reconnect heater supply hose.
(4) Reconnect engine coolant temperature sensor
connector.
(5) Install thermostat (Refer to 7 - COOLING/EN-
GINE/ENGINE
COOLANT
INSTALLATION).
(6) Fill cooling system (Refer to 7 - COOLING/EN-
GINE - STANDARD PROCEDURE).
WATER PUMP
DESCRIPTION
DESCRIPTION - 2.0L/2.4L
The water pump has a diecast aluminum body and
housing with a stamped steel impeller. The water
pump bolts directly to the block (Fig. 35) and is
driven by the timing belt. Cylinder block to water
pump sealing is provided by a rubber O-ring.
Fig. 35 Water Pump - 2.0L/2.4L
1 - CYLINDER BLOCK
2 - PUMP BODY
DESCRIPTION - 2.7L
The 2.7L pump has a die cast aluminum housing
and a plastic swept vane impeller. It bolts directly to
the cylinder block, behind the timing chain cover
(Fig. 36). The water pump is driven by the back side
of the engine's primary timing chain.
DIAGNOSIS AND TESTING - WATER PUMP
To determine whether coolant is flowing through
the cooling system, use one of the following proce-
dures:
THERMOSTAT
-
Fig. 36 Water Pump—2.7L Engine
1 - WATER PUMP BODY
2 - IMPELLER
3 - GASKET
PREFERRED METHOD
WARNING: DO NOT REMOVE THE COOLING SYS-
TEM PRESSURE CAP OR ANY HOSE WITH THE
SYSTEM HOT AND UNDER PRESSURE BECAUSE
SERIOUS BURNS FROM COOLANT CAN OCCUR.
• 2.0L/2.4L: Remove pressure cap when engine is
cold. Remove small amount of coolant. Idle engine
until thermostat opens. You should observe coolant
flow while looking down the filler neck. Once flow is
detected install the pressure cap. Replace removed
coolant into coolant recovery container.
• 2.7L: Start engine, coolant flow should be
observable in coolant pressure container when rev-
ving the engine.
ALTERNATIVE METHOD
• If engine is cold, idle engine until normal oper-
ating temperature is reached. Feel the upper radiator
hose. If it is hot, coolant is circulating.
JR
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