I just changed my thermostat from a 195 to a 180 and now my engine light is on and when idling in park the temp goes past 210 and it didnt do that with the 195 wtf is goin on? Do i need to reprogram the stupid computer telling it its something else?

its full of collant? bad thermostat?

light on disconnect batt for a couple of minutes let codes clear see if it returns

Thanks