Coolant; Coolant Performance; Engine Thermostat - Chrysler 2000 LHS Owner's Manual

LH
DESCRIPTION AND OPERATION (Continued)

COOLANT

DESCRIPTION
CAUTION: Use of Propylene Glycol based coolants
is not recommended, as they provide less freeze
protection and less corrosion protection.
The use of aluminum cylinder blocks, cylinder
heads, and water pumps requires special corrosion
protection. Mopar
Year/100,000 Mile Formula (orange in color), or the
equivalent ethylene glycol base coolant with corrosion
inhibitors (called HOAT, for Hybrid Organic Additive
Technology) is recommended. This coolant offers the
best engine cooling without corrosion when mixed
with 50% Ethylene Glycol and 50% distilled water to
obtain a freeze point of -37°C (-35°F). If it loses color
or becomes contaminated, drain, flush, and replace
with fresh properly mixed coolant solution. Mixing of
coolants other than specified (non-HOAT), will reduce
the 5 year/100,000 mile corrosion protection.
OPERATION
The cooling system is designed around the coolant.
The coolant must accept heat from engine metal, in
the cylinder head area near the exhaust valves and
engine block. Then carry this heat to the radiator
where the tube/fin radiator can give it up to the air.
WARNING: ANTIFREEZE IS AN ETHYLENE GLYCOL
BASE COOLANT AND IS HARMFUL IF SWAL-
LOWED OR INHALED. IF SWALLOWED, DRINK
TWO GLASSES OF WATER AND INDUCE VOMIT-
ING. IF INHALED, MOVE TO FRESH AIR AREA.
SEEK MEDICAL ATTENTION IMMEDIATELY. DO NOT
STORE IN OPEN OR UNMARKED CONTAINERS.
WASH SKIN AND CLOTHING THOROUGHLY AFTER
COMING IN CONTACT WITH ETHYLENE GLYCOL.
KEEP OUT OF REACH OF CHILDREN. DISPOSE OF
GLYCOL BASE COOLANT PROPERLY, CONTACT
YOUR DEALER OR GOVERNMENT AGENCY FOR
LOCATION OF COLLECTION CENTER IN YOUR
AREA. DO NOT OPEN A COOLING SYSTEM WHEN
THE ENGINE IS AT OPERATING TEMPERATURE OR
HOT UNDER PRESSURE, PERSONAL INJURY CAN
RESULT. AVOID RADIATOR COOLING FAN WHEN
ENGINE COMPARTMENT RELATED SERVICE IS
PERFORMED, PERSONAL INJURY CAN RESULT.

COOLANT PERFORMANCE

Performance is measurable. For heat transfer, pure
water absorbs 1 btu for each degree of temperature
rise for each pound of water. This formula is altered
when necessary additives to control boiling, freezing,
and corrosion are added as follows:
Antifreeze/Coolant,
• Pure Water (1 btu) boils at 100°C (212°F) and
freezes at 0°C (32°F).
• 100 Percent ethylene glycol (.7 btu) can cause an
engine to run hot, cause detonation, and will freeze
at -22°C (-8°F).
• 50/50 Ethylene Glycol and Distilled Water (.82
btu) is the recommended combination that provides a
freeze point of -37°C (-35°F). The radiator, water
pump, engine water jacket, radiator pressure cap,
thermostat, temperature gauge, coolant sensor and
5
heater are all designed for 50/50 ethylene glycol.
Where required, a 56 percent glycol and 44 percent
water mixture will provide a freeze point of -46°C
(-50°F).
NOTE: Richer mixtures cannot be measured with
field equipment and can lead to problems associ-
ated with 100 percent glycol. If there is doubt that
the coolant mixture is too rich for field equipment
to measure, put a sample in a clean container. Add
exactly the same amount of water and retest. If the
coolant in the vehicle is 100% antifreeze, the diluted
sample will read 50%. If the coolant in the vehicle
was 70% antifreeze and 30% water, the diluted sam-
ple will read as 35%, etc.
SELECTION AND ADDITIVES
The use of aluminum cylinder blocks, cylinder
heads, intake manifolds, and water pumps require
special corrosion protection. Mopar Antifreeze/Cool-
ant, 5 Year/100,000 Mile Formula (orange in color),
or the equivalent is recommended. This coolant pro-
vides optimum engine cooling and protection against
corrosion when mixed to a freeze point of -37°C
(-35°F) to -59°C (-50°F). If it looses color or becomes
contaminated; drain, flush, and replace with fresh
properly mixed solution.
CAUTION: Do not use well water, or suspect water
supply in cooling system. A 50/50 ethylene glycol
and distilled water mix is recommended.

ENGINE THERMOSTAT

DESCRIPTION
The thermostat on the 2.7L and 3.2/3.5L engines
are located on the lower left side of engine, near the
front (Fig. 2) and (Fig. 3). The thermostat on both
engines are on the inlet side of the water pump. The
thermostats have an air bleed located in the thermo-
stat flange. The air bleed allows internal trapped air
during cooling system filling to be released.
COOLING SYSTEM 7 - 3