*Update*

I replaced the Coolant temperature sensor last night without it making a difference.

I'm pretty stumped at this point. One other note is that this problem occurred shortly (2 weeks) before the headgasket went. Since I was loosing coolant before this I put in a good bit of Radiator stop leak to delay the inevitable.

After this I did a complete rebuild on the engine; I'm starting to think that possibly one of the smaller coolant lines could be sludged with the stop leak or something?

Any other ideas?

93' Toy xCab
bobbed > 22rEB > w56 > stock duals > SAS > 4.88's > 37's