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Sounds like your car has a blown head gasket or cracked engine/head. The engine does still heat up it's just that the coolant is not full enough to make contact with the sensors. Check your oil it also may look a cloudy/milky color, this would be water that has got into the oil. Your vehicle needs major repair and will stop running completely before long. The longer your drive a car with these problems the more damage it will cause.

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Q: Car does not heat up and oil in the coolant?
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