Thread: Whats wrong? Coolant temp sensor or Thermostat?

Well you must have a failed thermostat or a 160/180°F thermostat.

Normal operating temperature is 200°F. The stock thermostat is 195°F. Reaching 210 in warm weather is not abnormal by any means, especially when driving in city traffic.

I'm running a 180°F thermostat without a tune, and my temp is usually 190-195°. It rarely reaches 200, but will with enough traffic. My stock t-stat would run it at around 203 ish normally, and go higher with traffic.