T-stat.

all other variants cause consistent high/low temp levels. nothing in the system is able to radically swing temps more than a thermostat that is acting weird (For whatever reason)

 

but 3 different t-stats one of them being oem toyota one?
SORRY WAS BUSY INSTALLING FRONT MAIN SEAL ON THE OLD GIRL AND HAVENT HAD A CHANCE TO PUT WATER IN THE COOLING SYSTEM PROB TOMORROW. TILL THEN FELLOW YOTA MEMBERS......

 

problem solved too much antifreze not enough water thanks
GorgeRunner, all this freeking time it was the coolant would of never thought of it being that my problem THANKS AGAIN MAN!

 

Everyone enjoys a happy ending.

 

I'll remember this. Glad to see it worked out.