INSTALLATION—3.3L AND 3.8L ENGINE
Place a new gasket (dipped in water) on the water
box surface, center thermostat into opening in the in-
take manifold. Place housing over gasket and ther-
mostat, making sure thermostat is in recess provided
(Fig. 13). Bolt housing to intake manifold, tighten
bolts to 28 N
Im (250 in. lbs.). Refill cooling system
(see Refilling System).
COOLANT
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. Then
carry this heat to the radiator where the tube/fin as-
semblies of these components can give it up to the
air.
PERFORMANCE
Performance is measurable. For heat transfer pure
water excels (Formula = 1 btu per minute 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:
• Pure Water (1 btu) boils at 100°C (212°F) and
freezes at 0°C (32°F).
• 100 Percent Glycol (.7 btu) can cause a hot engine
and detonation and will raise the freeze point to 22°C
(-8°F).
• 50/50 Glycol and Water (.82 btu) is the recom-
mended combination that provides a freeze point of
-37°C(-35°F).The radiator, water pump, engine water
jacket, radiator pressure cap, thermostat, tempera-
ture gauge, sending unit and heater are all designed
for 50/50 glycol.
Where required, a 56 percent glycol and 44 percent
water mixture will provide a freeze point of-59°C
(-50°F).
CAUTION: Richer mixtures cannot be measured
with field equipment which can lead to problems
associated with 100 percent glycol.
SELECTION AND ADDITIVES
The use of aluminum cylinder heads, intake mani-
folds, and water pumps requires special corrosion
protection. Mopar Antifreeze, Prestone II, Peak or
antifreeze containing Alugard 340-2, or their equiva-
lent are recommended for best engine cooling with-
out corrosion. When mixed only to a freeze point of
Fig. 11 Thermostat, Housing, and Water Box—3.0L
Engine
Fig. 12 Thermostat Installed—3.0L Engine
Fig. 13 Thermostat, Housing and Waterbox—3.3L
and 3.8L Engine
7 - 14
COOLING SYSTEM
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