We have issues all the time with people changing out the thermostat & it still runs hot 90% of the time it is air bubbles. try putting a funnel in the radiator fill with coolant & let car run for a while. Sometimes giving the car gas while doing this helps.That should work the air out .
Try bumping the thermostat to 180. With a 160 you may not be allowing the water to stay in the radiator long enough to actually cool off. It is a misconception that a lower thermostat temp will allow the car to run cooler.
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