Engine Lazy T Stat ?

Driving last night . Do a small pull with the car no big deal car is running 178-180 . It has a 180 stat the air was real Crisp and cool last night . Get off highway cruising through The streets back to my garage . I notice the temp creeping up . Creeps To 200 on the gauge . My Pms is reading 200-206 at the temp sensor . Never over heats . Fan working fine

This morning I get up change the oil to make sure everything was ok . Coolant is clean . Run the car it creeps up again on me and then is fine . I drive the car all day never goes over 190 . Leave work tonight and it does the same it did to me last night after I get off the highway temp wise except I didn't do any pull . Didn't last as long this time and went right back to normal temp .

Am I wrong in saying Maybe the thermostat is closing with how cool engine temp is getting and then it's partial opening until it eventually comes back all the way open ?

It's also drilled at 12 and 6 to allow coolant bypass all the time . This was to help aid in any air pockets and also in a situation if it ever got stuck shut .


Sent from my iPhone using my fingers while my auto correct makes me seem illiterate