ENGINE
TABLE OF CONTENTS
page page
COOLANT
DESCRIPTION ..........................9
DIAGNOSIS AND TESTING - COOLING
SYSTEM LEAKS ......................10
STANDARD PROCEDURE
STANDARD PROCEDURE - ADDING
ADDITIONAL COOLANT .................11
STANDARD PROCEDURE - DRAINING
COOLING SYSTEM ....................12
STANDARD PROCEDURE - REFILLING
COOLING SYSTEM ....................12
COOLANT RECOVERY PRESSURE
CONTAINER
DESCRIPTION .........................12
OPERATION ...........................12
REMOVAL .............................13
INSTALLATION .........................13
ENGINE COOLANT TEMP SENSOR
REMOVAL .............................13
INSTALLATION .........................13
ENGINE COOLANT THERMOSTAT
REMOVAL .............................14
INSTALLATION .........................14
WATER PUMP
REMOVAL .............................14
INSTALLATION .........................15
RADIATOR FAN
DESCRIPTION .........................15
OPERATION ...........................16
REMOVAL .............................17
INSTALLATION .........................18
RADIATOR PRESSURE CAP
DESCRIPTION .........................19
OPERATION ...........................20
DIAGNOSIS AND TESTING - RADIATOR
PRESSURE CAP ......................20
CLEANING ............................20
INSPECTION ..........................20
RADIATOR
DESCRIPTION .........................20
DIAGNOSIS AND TESTING - RADIATOR FLOW
TEST ...............................20
REMOVAL .............................21
CLEANING ............................21
INSTALLATION .........................22
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
ambient air passing through the radiator and heater
core fins.
The required ethylene-glycol (antifreeze) and water
mixture depends upon the climate and vehicle oper-
ating conditions. The recommended mixture of 50/50
ethylene-glycol and water will provide protection
against freezing to -37 deg. C (-35 deg. F). The anti-
freeze concentration must always be a minimum of
44 percent, year-round in all climates. If percentage
is lower than 44 percent, engine parts may be
eroded by cavitation, and cooling system com-
ponents may be severely damaged by corrosion.
Maximum protection against freezing is provided
with a 68 percent antifreeze concentration, which
prevents freezing down to -67.7 deg. C (-90 deg. F). A
higher percentage will freeze at a warmer tempera-
ture. Also, a higher percentage of antifreeze can
cause the engine to overheat because the specific
heat of antifreeze is lower than that of water.
100 Percent Ethylene-Glycol—Should Not Be Used in
Chrysler Vehicles
Use of 100 percent ethylene-glycol will cause for-
mation of additive deposits in the system, as the cor-
rosion inhibitive additives in ethylene-glycol require
the presence of water to dissolve. The deposits act as
insulation, causing temperatures to rise to as high as
149 deg. C (300 deg. F). This temperature is hot
enough to melt plastic and soften solder. The
increased temperature can result in engine detona-
tion. In addition, 100 percent ethylene-glycol freezes
at -22 deg. C (-8 deg. F ).
Propylene-glycol Formulations—Should Not Be Used in
Chrysler Vehicles
Propylene-glycol formulations do not meet
Chrysler coolant specifications. It’s overall effec-
tive temperature range is smaller than that of ethyl-
ene-glycol. The freeze point of 50/50 propylene-glycol
and water is -32 deg. C (-26 deg. F). 5 deg. C higher
than ethylene-glycol’s freeze point. The boiling point
(protection against summer boil-over) of propylene-
WG ENGINE 7a - 9
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