Engine/trans pulled

[C420sailor]

Owned the truck since 01 and always had the gauge move around. I have a stant superstat Tstat now and it moves much less. There was a tsb and a special bypass hose (long gone). It has to do with steam formation. Another TSB was to replace the temp sender and Tstat. From what I also read (in the owners manual) it could take up to 7500 miles to fully bleed the coolant system!!!! I doubt it is dropping down to 120. Should be in the 175-190 range.

My SOHC was doing that dip in the deep winter...but it was largely staying there. Was a bad thermostat.

 

[KeenKilo]

Had firestone flush the system and now I’ve got that hot hot heat.

Tried the hill trick first and got some soda bubbles out but no burps. Had room temp heat blowing out.

System need a flush anyways with all the new goodies. You can see there was still rust or whatever all in the system