2013 mazdaspeed3 temperature thermostat issue

[Alexneal98]

I have a 2013 mazdaspeed 3. I just replaced my temperature thermostat because it was throwing code p0128. I took it for a small drive to see if the thermostat worked right after I was all done. And my temperature got up to 225. Does anyone know what might be going on with it. The temperature was staying below 215 before I put the new one in.

 

[SyntheticAtmosphere]

There may still be air pockets in the system. These engine are a bit difficult to burp and I find I still need to add some coolant daily for about 3 days after working on the cooling system. As long as the car isnt overheating, just take it easy.

 

[jsmith]

The process to burp the coolant system is get it up to temp. Then sit at 3k RPM for ~2 minutes, then blip to 4k. Rinse and repeat a few times.

If you have air in the system, and you give it the beans (even a little) temp reading is going to spike up like you are describing.