Just to be sure --- have you had the radiator cap OFF when the car is cold ----- and then let the motor come up to temp --- and watch the water flow when the thermostat opens up??
You always have to be careful doing this - because sometimes they'll "burp" hot coolant..... but sometimes that's the problem! They have air trapped in the system that needs to get the hell out of there!
It's also useful information for you to see the water flow and now it's going the right way and has some pretty good movement to it.
If your cap is on the driver side tank -- where is your upper hose? Assuming the bottom (suction) hose is on the passenger bottom...
With this arrangement - water should be coming into the tank from the upper hose.
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