Dodge Durango (HB). Manual — part 132
REMOVAL - 3.7L/4.7L/5.7L
CAUTION: DO NOT LET TENSIONER ARM SNAP
BACK TO THE FREEARM POSITION, SEVER DAM-
AGE MAY OCCUR TO THE TENSIONER.
Belt tension is not adjustable. Belt adjustment is main-
tained by an automatic ( spring load ) belt tensioner.
1. Disconnect negative battery cable from battery.
2. Rotate belt tensioner (6) until it contacts it’s stop.
Remove belt (2), then slowly rotate the tensioner
(6) into the freearm position.
INSTALLATION - 3.7L/4.7L/5.7L
Belt tension is not adjustable. Belt adjustment is main-
tained by an automatic ( spring load ) belt tensioner.
1. Check condition of all pulleys.
CAUTION: When installing the serpentine acces-
sory drive belt, the belt MUST be routed correctly.
If not, the engine may overheat due to the water
pump rotating in the wrong direction.
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ACCESSORY DRIVE
7 - 23
2. Install new belt. Route the belt around all pulleys
except the idler pulley (5). Rotate the tensioner
arm until it contacts it’s stop position. Route the
belt around the idler (5) and slowly let the ten-
sioner rotate into the belt. Make sure the belt is
seated onto all pulleys.
3. With the drive belt installed, inspect the belt wear
indicator. On 4.7L Engines only, the gap between
the tang and the housing stop (measurement A)
must not exceed 24 mm (.94 inches). If the mea-
surement exceeds this specification replace the
serpentine accessory drive belt.
7 - 24
ACCESSORY DRIVE
HB
ENGINE
TABLE OF CONTENTS
page
page
CONTAINER-COOLANT RECOVERY
. . . . . . . . . . . . . . . . . . . . . . . . . 25
. . . . . . . . . . . . . . . . . . . . . . . . . . . 26
HEATER-ENGINE BLOCK
. . . . . . . . . . . . . . . . . . . . . . . . . 26
. . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DIAGNOSIS AND TESTING - ENGINE BLOCK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
. . . . . . . . . . . . . . . . . . . . . . . . . 27
SENSOR-ENGINE COOLANT TEMPERATURE
. . . . . . . . . . . . . . . . . . . . . . . . . 28
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
. . . . . . . . . . . . . . . . . . . . . . . . . 29
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
. . . . . . . . . . . . . . . . . . . . . . . . . 30
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
THERMOSTAT-ENGINE COOLANT
. . . . . . . . . . . . . . . . . . . . . . . . . 32
. . . . . . . . . . . . . . . . . . . . . . . . . . . 32
DIAGNOSIS AND TESTING - THERMOSTAT
. . . . . . . . . . . . . . . . . . . . . . . . . 33
. . . . . . . . . . . . . . . . . . . . . 34
. . . . . . . . . . . . . . . . . . . . . . . . . 35
. . . . . . . . . . . . . . . . . . . . . 35
RADIATOR
. . . . . . . . . . . . . . . . . . . . . . . . . 36
. . . . . . . . . . . . . . . . . . . . . . . . . . . 36
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
. . . . . . . . . . . . . . . . . . . . . . . . . . 38
. . . . . . . . . . . . . . . . . . . . . . . . . 39
CAP-RADIATOR PRESSURE
. . . . . . . . . . . . . . . . . . . . . . . . . 40
. . . . . . . . . . . . . . . . . . . . . . . . . . . 40
RADIATOR CAP-TO-FILLER NECK SEAL
. . . . . . . . . . . . . . . . . . . . . . 41
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
. . . . . . . . . . . . . . . . . . . . . . . . . . 41
PUMP-WATER
. . . . . . . . . . . . . . . . . . . . . . . . 42
. . . . . . . . . . . . . . . . . . . . . . . . 43
WATER PUMP BYPASS - 4.7L ENGINE
. . . . . . . . . . . . . . . . . . . . . 43
. . . . . . . . . . . . . . . . . . . . . . . . . 44
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
. . . . . . . . . . . . . . . . . . . . . . . . . . 45
. . . . . . . . . . . . . . . . . . . . . . 45
. . . . . . . . . . . . . . . . . . . . . . . . . 46
FAN-RADIATOR VISCOUS
. . . . . . . . . . . . . . . . . . . . . . . . . 47
. . . . . . . . . . . . . . . . . . . . . . . . . . . 47
DIAGNOSIS AND TESTING - VISCOUS FAN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
. . . . . . . . . . . . . . . . . . . . . . . . . . 50
. . . . . . . . . . . . . . . . . . . . . . . . . 50
TUBE-WATER PUMP INLET
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
. . . . . . . . . . . . . . . . . . . . . . . . . 51
CONTAINER-COOLANT RECOVERY
DESCRIPTION
The coolant recovery containeris integral to the upper fan shroud assembly and is made of high temperature plastic.
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ENGINE
7 - 25
OPERATION
The coolant recovery container works in conjunction
with the radiator pressure cap. It utilizes thermal
expansion and contraction of coolant to keep coolant
free of trapped air. It provides a volume for expansion
and contraction of coolant. It also provides a conve-
nient and safe method for checking coolant level and
adjusting level at atmospheric pressure. This is done
without removing the radiator pressure cap. The sys-
tem also provides some reserve coolant to the radia-
tor to cover minor leaks and evaporation or boiling
losses.
As the engine cools, a vacuum is formed in the cool-
ing system of both the radiator and engine. Coolant
will then be drawn from the coolant tank and returned
to a proper level in the radiator.
HEATER-ENGINE BLOCK
DESCRIPTION
WARNING: DO NOT OPERATE ENGINE UNLESS
BLOCK
HEATER
CORD
HAS
BEEN
DISCON-
NECTED FROM POWER SOURCE AND SECURED
IN
PLACE.
THE
POWER
CORD
MUST
BE
SECURED IN ITS RETAINING CLIPS AND ROUTED
AWAY FROM EXHAUST MANIFOLDS AND MOVING
PARTS.
An optional engine block heater is available on all
models. The heater is equipped with a power cord.
The heater is mounted in a core hole of the engine
cylinder block (1) (in place of a freeze plug) with the
heating element immersed in engine coolant. The cord
is attached to an engine compartment component with
tie-straps.
OPERATION
The heater warms the engine coolant providing easier engine starting and faster warm-up in low temperatures. Con-
necting the power cord to a grounded 110-120 volt AC electrical outlet with a grounded three wire extension cord
provides the electricity needed to heat the element..
DIAGNOSIS AND TESTING - ENGINE BLOCK HEATER
If the unit does not operate, possible causes can be either the power cord or the heater element. Test the power
cord for continuity with a 110-volt voltmeter or 110-volt test light. Test heater element continuity with an ohmmeter
or a 12-volt test light.
7 - 26
ENGINE
HB
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