Hello i have 2010 chrysler sebring and the issue that im having is below 35 MPH the temperature gauge needle is right on the have way mark reading about 200-2010 F but when accelerate and go above 40MPH the needle drop at the 1/4 mark and the temperature reading its at 159-170F??i replace the thermostat,ECT sensors< i did and coolant system flush but nothing has fix this issue

 

What motor size is under the hood?

 

its is 2.4 L Engine

 

2.4 L ENgine

 

You posted that you replaced the thermostat....Unless I'm thinking of the wrong design 2.4, there are TWO thermostats for the 2.4 motor and best to replace both at the same time.
Unless I'm mistaken, the 2010 Sebring, 200 and Avenger are the same platform and motor options.

 

Yes you are right the engine hs two thermostads but i replace both with motoras brand and did a flush n the coolant