2007 Saturn Aura Thermostat

How hot does the engine get in degrees F? Have you replaced the thermostat recently? That is a maintenance item. Have you checked for applicable trouble codes anything pointing to the cts or cooling system fan/s, anything? To check codes, yourself, at the least, you need an obd2 code reader. Some of the national brand autostores will check codes for free.

Check coolant flow and check for combustion gases in the coolant. Are you losing coolant? Sometimes you need to check for air in the cooling system.

Just to add, I would expect overheating to occur idling around town, not on the highway. It still wouldn't hurt to check suggestions in other post.

The top replaced components for overheating is, water pump--thermostat--radiator. It would be foolish to replace anything unless testing pointed in that direction.

Oh, I believe there is a code for your thermostat as well some other issues I listed. I can only make suggestions, you have to do the testing.

Hope you get it going your way.