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You can grab the top hose when this happens and the engine is wram? That is signs of a water pump spinning freely on the shaft or the thermostat. You mentioned you did the thermostat already. Did you do the water pump?
Was the harness tested for the coolant temp sensor for the PCM back to the PCM for shortages in that harness? If you did the sensor and didn't do the plug end, I suggest getting a pigtail kit and replacing that plug end. This will rule out the electrical and possibly even solve this intermittent issue. With it being intermittent, I am thinking the plug end is loose and not contacting correctly causing the issue.
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