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Also, if your lower hose remains cold, either your thermostat is not opening, or more likely, there are still are pockets... Air pockets trapped behind the thermostat can potentially cause it to not open, always make sure the hole/jiggle valve is directly at the top most point (12 o'clock) when installing the thermostat, and following the FSM for bleeding the cooling system of air!
If after changing the ECT gauge sensor, and re-bleeding the system, and you're still having coolant temp issues, look into pressure/vacuum testing your cooling system for minute leaks.
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