The car has two temp sensors on it and one is marked 119 degrees. When I plugged into that one the fan came on and never shut off. That is what I meant with "on high all the time". That is the only way it seemed to cool the engine at all. So some how the cool water was getting mixed or pumped into the block enough that the temp gauge installed at the head, that would be the aftermarket one, would show 160 or so. Unplug the fan and the temp would rise to 210 on the gauge and boil over on the overflow would ensue.
i forget; cause all my have the Top rad hose as the coolest point, and its flowed from the water pump pushed to the top of rad, and flow,cool,the head.
160f is fine, water boils around 212f, so your gauge reading 210f is aok to me, did you have cap on when you did this running?reservoir cap,,
i totally forget coolant mix boiling point, a lot higher than 212f(water boil pt), so if you saying farenheit, your well cool, put reservoir cap on,,??