Durango 4WD V8-5.9L VIN Z (1998)
Coolant: Description and Operation
The cooling system is designed around the coolant. Coolant flows through the engine water jacket absorbing heat produced during engine operation. The
coolant carries the heat to radiator and heater core. Here it is transferred to the ambient air passing through the radiator and heater core fins. The coolant
also removes heat from the automatic transmission fluid in vehicles equipped with an automatic transmission.
The cooling system factory fill is a mixture of 50% Ethylene Glycol based antifreeze and 50% water.
Using a suitable hydrometer, measure antifreeze concentration in the radiator when the engine is cool. If the cooling system has recently been serviced,
allow coolant to circulate for at least 20 minutes before taking hydrometer reading. Properly mixed coolant will protect the cooling system to -37°C (-35°
F). If the freeze protection is above -28°C (-20°F), drain enough coolant from the cooling system to allow room to add antifreeze to achieve adequate
protection.
Chrysler Corporation recommends Mopar Antifreeze/Coolant or a high quality, ethylene glycol base antifreeze/coolant, with a silicate inhibitor.
