Wrangler 2WD V6-3.8L (2008)
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.
CAUTION: Mopar(R) Antifreeze/Coolant, 5Year 160,000 km (100,000 Mile) Formula (MS-9769) may not be mixed with any other type of
antifreeze. Mixing of coolants other than specified (non-HOAT or other HOAT), may result in engine damage that may not be covered under
the new vehicle warranty, and decreased corrosion protection.
COOLANT PERFORMANCE
The required ethylene-glycol (antifreeze) and water mixture depends upon climate and vehicle operating conditions. The coolant performance of various
mixtures follows:
Pure Water- Water can absorb more heat than a mixture of water and ethylene-glycol. This is for purpose of heat transfer only. Water also freezes at a
higher temperature and allows corrosion.
100 % Ethylene-Glycol- The corrosion inhibiting additives in ethylene-glycol need the presence of water to dissolve. Without water, additives form
deposits in system. These act as insulation causing temperature to rise to as high as 149°C (300°F). This temperature is hot enough to melt plastic and
soften solder. The increased temperature can result in engine detonation. In addition, 100 % ethylene-glycol freezes at -22°C (-8°F).
50/50 Ethylene-Glycol and Water -Is the recommended mixture, it provides protection against freezing to -37°C (-34°F). The antifreeze concentration
must always be a minimum of 44 %, year-round in all climates. If percentage is lower, engine parts may be eroded by cavitation. Maximum protection
against freezing is provided with a 68 % antifreeze concentration, which prevents freezing down to -67.7°C (-90°F). A higher percentage will freeze at a
warmer temperature. Also, a higher percentage of antifreeze can cause the engine to overheat because specific heat of antifreeze is lower than that of
water.
CAUTION: Richer antifreeze mixtures cannot be measured with normal field equipment and can cause problems associated with 100 percent
ethylene-glycol.
COOLANT SELECTION AND ADDITIVES
The use of aluminum cylinder blocks, cylinder heads and water pumps requires special corrosion protection. Only Mopar(R) Antifreeze/Coolant, 5
Year/100,000 Mile Formula (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% distilled water to obtain 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.
CAUTION: Do not use coolant additives that are claimed to improve engine cooling.
Operation
OPERATION
Coolant flows through the engine block absorbing the heat from the engine, then flows to the radiator where the cooling fins in the radiator transfers the
heat from the coolant to the atmosphere. During cold weather the ethylene-glycol coolant prevents water present in the cooling system from freezing
within temperatures indicated by mixture ratio of coolant to water.
