thermostat problems chrysler 300m special?

gina

New member
I recently bought a chrysler 300m special I notice it didn't heat up so I toke it in and had a new thermastat put in now it heats up but when I drive it on the highway the temp needle begins to drop and my new car starts to eat a lot of gas does anybody have any suggestion on how to fix this or maybe know whats wrong with the car. Thanks for any suggestions you may have.
 
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