Overheating 2003 Saturn L

Oil in my radiator reserve, but no water in my oil. car overheating. Whats going on???

Probably a bad head gasket.

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Yup, agree, bad head gasket.

Check the transmission fluid.

If the transmission fluid cooler in the radiator has a leak, transmission fluid will get into the coolant. And coolant will get into the transmission. Causing the transmission to run hot.