So I put a new water pump in my truck. I flush everything put a new thermostat in. Now my temp gauge is running on the o to r. Before it was running at the n. The thermostat I put in is a 195 to 200*. Would the the new thermostat make it run warmer? Or do I have a bad thermostat?
2007 f250 Sd fx4
Arp's, 4"dp 5" straight pipe with 7" stack,S&B intake, no limit cold side, blue spring, 6.4 banjos, gauges, 2.5" leveling kit,sct with gearhead tunes, egr delete and coolant filter warren 175s, powermax
Stuck open is about the most common thermostat failure. Your truck was probably running too cool before. It might also have been a lower open-point thermostat. It'll be interesting to see if your mileage goes up any.