Replaced thermostat that was stuck open. Now my 2006 Nissan Xterra is overheating. Why?!

Check the very high end on the pipes what go into the firewall on the passenger side.
You will find a rubber cap, 1/4 inch internal diameter, pinched with a C-clamp to the pipes.
Let your engine cool down.Remove the cap and fill coolant until it flows from this bleeding port.
Close it, do not forget to put a C-clamp in place, ENJOY.

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