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Check for "fog" or smells coming from the heater core, indicating a heater core leak. Check the oil for a milky color in case coolant is leaking into the oil. If these areas are ok, then perform a pressure test on the cylinders, as there is probably a blown head gasket allowing coolant to leak into the cylinder and be lost through the exhaust.

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Q: What Causes Mystery coolant loss no visible leak Grand Cherokee?
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