My car turns over but won't start. It overheated on highway.
If the vehicle overheated on the highway there is a high possibility that major engine damage has occurred, which gives reason as to why the vehicle won’t start now. If it did overheated, the chances of the head gasket being blown out are very high. A proper inspection of why you car overheated in the first place should be carried by a qualified technician in order to get your car to starting again.