Well...found out something interesting today.
After a quick minute warm-up this morning...I made my standard runs in closed loop. After the truck sat fer about an hour, starting coolant temp was at 146°F. Started the truck up and waited fer it to go to closed loop. About 4 minutes later, it finally went to closed loop. Coolant temp had risen to 188°F. Ambient air temp was about 45°F. What gives? My normal coolant temp is about 206°F.
I also noticed that when I coast, it registers as open loop when the injectors cut off. Hmmm...